diff --git a/runners/core-construction-java/src/test/java/org/apache/beam/runners/core/construction/MorePipelineTest.java b/runners/core-construction-java/src/test/java/org/apache/beam/runners/core/construction/MorePipelineTest.java
index 267b4d5..369aad9 100644
--- a/runners/core-construction-java/src/test/java/org/apache/beam/runners/core/construction/MorePipelineTest.java
+++ b/runners/core-construction-java/src/test/java/org/apache/beam/runners/core/construction/MorePipelineTest.java
@@ -25,18 +25,14 @@
 import java.util.List;
 import java.util.concurrent.atomic.AtomicReference;
 import org.apache.beam.sdk.Pipeline.PipelineVisitor;
-import org.apache.beam.sdk.coders.BigEndianLongCoder;
 import org.apache.beam.sdk.coders.Coder;
-import org.apache.beam.sdk.coders.KvCoder;
 import org.apache.beam.sdk.io.GenerateSequence;
-import org.apache.beam.sdk.io.range.OffsetRange;
 import org.apache.beam.sdk.runners.AppliedPTransform;
 import org.apache.beam.sdk.runners.PTransformOverride;
 import org.apache.beam.sdk.runners.TransformHierarchy.Node;
 import org.apache.beam.sdk.testing.TestPipeline;
 import org.apache.beam.sdk.transforms.Materializations;
 import org.apache.beam.sdk.transforms.PTransform;
-import org.apache.beam.sdk.transforms.ParDo;
 import org.apache.beam.sdk.transforms.View;
 import org.apache.beam.sdk.values.KV;
 import org.apache.beam.sdk.values.PCollection;
@@ -103,22 +99,13 @@
 
     @Override
     public PCollectionView<List<T>> expand(PCollection<T> input) {
+      PCollection<KV<Void, T>> materializationInput =
+          input.apply(new View.VoidKeyToMultimapMaterialization<>());
       Coder<T> inputCoder = input.getCoder();
-      PCollection<KV<Long, PCollectionViews.ValueOrMetadata<T, OffsetRange>>> materializationInput =
-          input
-              .apply("IndexElements", ParDo.of(new View.ToListViewDoFn<>()))
-              .setCoder(
-                  KvCoder.of(
-                      BigEndianLongCoder.of(),
-                      PCollectionViews.ValueOrMetadataCoder.create(
-                          inputCoder, OffsetRange.Coder.of())));
       PCollectionView<List<T>> view =
-          PCollectionViews.listView(
+          PCollectionViews.listViewUsingVoidKey(
               materializationInput,
-              (TupleTag<
-                      Materializations.MultimapView<
-                          Long, PCollectionViews.ValueOrMetadata<T, OffsetRange>>>)
-                  originalView.getTagInternal(),
+              (TupleTag<Materializations.MultimapView<Void, T>>) originalView.getTagInternal(),
               (PCollectionViews.TypeDescriptorSupplier<T>) inputCoder::getEncodedTypeDescriptor,
               materializationInput.getWindowingStrategy());
       materializationInput.apply(View.CreatePCollectionView.of(view));
diff --git a/runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/IsmSideInputReader.java b/runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/IsmSideInputReader.java
index 35d865f..37fa6fc 100644
--- a/runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/IsmSideInputReader.java
+++ b/runners/google-cloud-dataflow-java/worker/src/main/java/org/apache/beam/runners/dataflow/worker/IsmSideInputReader.java
@@ -69,17 +69,11 @@
 import org.apache.beam.sdk.util.WindowedValue;
 import org.apache.beam.sdk.values.KV;
 import org.apache.beam.sdk.values.PCollectionView;
-import org.apache.beam.sdk.values.PCollectionViews.HasDefaultValue;
 import org.apache.beam.sdk.values.PCollectionViews.IterableViewFn;
-import org.apache.beam.sdk.values.PCollectionViews.IterableViewFn2;
 import org.apache.beam.sdk.values.PCollectionViews.ListViewFn;
-import org.apache.beam.sdk.values.PCollectionViews.ListViewFn2;
 import org.apache.beam.sdk.values.PCollectionViews.MapViewFn;
-import org.apache.beam.sdk.values.PCollectionViews.MapViewFn2;
 import org.apache.beam.sdk.values.PCollectionViews.MultimapViewFn;
-import org.apache.beam.sdk.values.PCollectionViews.MultimapViewFn2;
 import org.apache.beam.sdk.values.PCollectionViews.SingletonViewFn;
-import org.apache.beam.sdk.values.PCollectionViews.SingletonViewFn2;
 import org.apache.beam.sdk.values.TupleTag;
 import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.annotations.VisibleForTesting;
 import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Function;
@@ -110,13 +104,7 @@
   private static final Object NULL_PLACE_HOLDER = new Object();
 
   private static final ImmutableList<Class<? extends ViewFn>> KNOWN_SINGLETON_VIEW_TYPES =
-      ImmutableList.of(
-          SingletonViewFn.class,
-          SingletonViewFn2.class,
-          MapViewFn.class,
-          MapViewFn2.class,
-          MultimapViewFn.class,
-          MultimapViewFn2.class);
+      ImmutableList.of(SingletonViewFn.class, MapViewFn.class, MultimapViewFn.class);
 
   /**
    * Limit the number of concurrent initializations.
@@ -314,7 +302,7 @@
       // We handle the singleton case separately since a null value may be returned.
       // We use a null place holder to represent this, and when we detect it, we translate
       // back to null for the user.
-      if (viewFn instanceof SingletonViewFn || viewFn instanceof SingletonViewFn2) {
+      if (viewFn instanceof SingletonViewFn) {
         ViewT rval =
             executionContext
                 .<PCollectionViewWindow<ViewT>, ViewT>getLogicalReferenceCache()
@@ -323,7 +311,7 @@
                     () -> {
                       @SuppressWarnings("unchecked")
                       ViewT viewT =
-                          getSingletonForWindow(tag, (HasDefaultValue<ViewT>) viewFn, window);
+                          getSingletonForWindow(tag, (SingletonViewFn<ViewT>) viewFn, window);
                       @SuppressWarnings("unchecked")
                       ViewT nullPlaceHolder = (ViewT) NULL_PLACE_HOLDER;
                       return viewT == null ? nullPlaceHolder : viewT;
@@ -331,10 +319,7 @@
         return rval == NULL_PLACE_HOLDER ? null : rval;
       } else if (singletonMaterializedTags.contains(tag)) {
         checkArgument(
-            viewFn instanceof MapViewFn
-                || viewFn instanceof MapViewFn2
-                || viewFn instanceof MultimapViewFn
-                || viewFn instanceof MultimapViewFn2,
+            viewFn instanceof MapViewFn || viewFn instanceof MultimapViewFn,
             "Unknown view type stored as singleton. Expected one of %s, got %s",
             KNOWN_SINGLETON_VIEW_TYPES,
             viewFn.getClass().getName());
@@ -351,19 +336,15 @@
             .get(
                 PCollectionViewWindow.of(view, window),
                 () -> {
-                  if (viewFn instanceof IterableViewFn
-                      || viewFn instanceof IterableViewFn2
-                      || viewFn instanceof ListViewFn
-                      || viewFn instanceof ListViewFn2) {
+                  if (viewFn instanceof IterableViewFn || viewFn instanceof ListViewFn) {
                     @SuppressWarnings("unchecked")
                     ViewT viewT = (ViewT) getListForWindow(tag, window);
                     return viewT;
-                  } else if (viewFn instanceof MapViewFn || viewFn instanceof MapViewFn2) {
+                  } else if (viewFn instanceof MapViewFn) {
                     @SuppressWarnings("unchecked")
                     ViewT viewT = (ViewT) getMapForWindow(tag, window);
                     return viewT;
-                  } else if (viewFn instanceof MultimapViewFn
-                      || viewFn instanceof MultimapViewFn2) {
+                  } else if (viewFn instanceof MultimapViewFn) {
                     @SuppressWarnings("unchecked")
                     ViewT viewT = (ViewT) getMultimapForWindow(tag, window);
                     return viewT;
@@ -394,7 +375,7 @@
    * </ul>
    */
   private <T, W extends BoundedWindow> T getSingletonForWindow(
-      TupleTag<?> viewTag, HasDefaultValue<T> viewFn, W window) throws IOException {
+      TupleTag<?> viewTag, SingletonViewFn<T> viewFn, W window) throws IOException {
     @SuppressWarnings({
       "rawtypes", // TODO(https://issues.apache.org/jira/browse/BEAM-10556)
       "unchecked"
diff --git a/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/Combine.java b/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/Combine.java
index a3b5665..63b4191 100644
--- a/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/Combine.java
+++ b/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/Combine.java
@@ -17,6 +17,7 @@
  */
 package org.apache.beam.sdk.transforms;
 
+import static org.apache.beam.sdk.options.ExperimentalOptions.hasExperiment;
 import static org.apache.beam.vendor.guava.v26_0_jre.com.google.common.base.Preconditions.checkState;
 
 import java.io.IOException;
@@ -46,6 +47,7 @@
 import org.apache.beam.sdk.transforms.CombineWithContext.Context;
 import org.apache.beam.sdk.transforms.CombineWithContext.RequiresContextInternal;
 import org.apache.beam.sdk.transforms.View.CreatePCollectionView;
+import org.apache.beam.sdk.transforms.View.VoidKeyToMultimapMaterialization;
 import org.apache.beam.sdk.transforms.display.DisplayData;
 import org.apache.beam.sdk.transforms.display.DisplayData.Builder;
 import org.apache.beam.sdk.transforms.display.HasDisplayData;
@@ -1306,21 +1308,43 @@
 
     @Override
     public PCollectionView<OutputT> expand(PCollection<InputT> input) {
+      // TODO(BEAM-10097): Make this the default expansion for all portable runners.
+      if (hasExperiment(input.getPipeline().getOptions(), "beam_fn_api")
+          && (hasExperiment(input.getPipeline().getOptions(), "use_runner_v2")
+              || hasExperiment(input.getPipeline().getOptions(), "use_unified_worker"))) {
+        PCollection<OutputT> combined =
+            input.apply(
+                "CombineValues",
+                Combine.<InputT, OutputT>globally(fn).withoutDefaults().withFanout(fanout));
+        Coder<OutputT> outputCoder = combined.getCoder();
+        PCollectionView<OutputT> view =
+            PCollectionViews.singletonView(
+                combined,
+                (TypeDescriptorSupplier<OutputT>)
+                    () -> outputCoder != null ? outputCoder.getEncodedTypeDescriptor() : null,
+                input.getWindowingStrategy(),
+                insertDefault,
+                insertDefault ? fn.defaultValue() : null,
+                combined.getCoder());
+        combined.apply("CreatePCollectionView", CreatePCollectionView.of(view));
+        return view;
+      }
+
       PCollection<OutputT> combined =
-          input.apply(
-              "CombineValues",
-              Combine.<InputT, OutputT>globally(fn).withoutDefaults().withFanout(fanout));
+          input.apply(Combine.<InputT, OutputT>globally(fn).withoutDefaults().withFanout(fanout));
+      PCollection<KV<Void, OutputT>> materializationInput =
+          combined.apply(new VoidKeyToMultimapMaterialization<>());
       Coder<OutputT> outputCoder = combined.getCoder();
       PCollectionView<OutputT> view =
-          PCollectionViews.singletonView(
-              combined,
+          PCollectionViews.singletonViewUsingVoidKey(
+              materializationInput,
               (TypeDescriptorSupplier<OutputT>)
                   () -> outputCoder != null ? outputCoder.getEncodedTypeDescriptor() : null,
               input.getWindowingStrategy(),
               insertDefault,
               insertDefault ? fn.defaultValue() : null,
               combined.getCoder());
-      combined.apply("CreatePCollectionView", CreatePCollectionView.of(view));
+      materializationInput.apply(CreatePCollectionView.of(view));
       return view;
     }
 
diff --git a/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/View.java b/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/View.java
index e81f0b8..904575c 100644
--- a/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/View.java
+++ b/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/View.java
@@ -17,6 +17,8 @@
  */
 package org.apache.beam.sdk.transforms;
 
+import static org.apache.beam.sdk.options.ExperimentalOptions.hasExperiment;
+
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -27,6 +29,7 @@
 import org.apache.beam.sdk.coders.Coder;
 import org.apache.beam.sdk.coders.CoderException;
 import org.apache.beam.sdk.coders.KvCoder;
+import org.apache.beam.sdk.coders.VoidCoder;
 import org.apache.beam.sdk.io.range.OffsetRange;
 import org.apache.beam.sdk.runners.TransformHierarchy.Node;
 import org.apache.beam.sdk.transforms.windowing.BoundedWindow;
@@ -257,16 +260,33 @@
        * Long#MIN_VALUE} key is used to store all known {@link OffsetRange ranges} allowing us to
        * compute such an ordering.
        */
+
+      // TODO(BEAM-10097): Make this the default expansion for all portable runners.
+      if (hasExperiment(input.getPipeline().getOptions(), "beam_fn_api")
+          && (hasExperiment(input.getPipeline().getOptions(), "use_runner_v2")
+              || hasExperiment(input.getPipeline().getOptions(), "use_unified_worker"))) {
+        Coder<T> inputCoder = input.getCoder();
+        PCollection<KV<Long, ValueOrMetadata<T, OffsetRange>>> materializationInput =
+            input
+                .apply("IndexElements", ParDo.of(new ToListViewDoFn<>()))
+                .setCoder(
+                    KvCoder.of(
+                        BigEndianLongCoder.of(),
+                        ValueOrMetadataCoder.create(inputCoder, OffsetRange.Coder.of())));
+        PCollectionView<List<T>> view =
+            PCollectionViews.listView(
+                materializationInput,
+                (TypeDescriptorSupplier<T>) inputCoder::getEncodedTypeDescriptor,
+                input.getWindowingStrategy());
+        materializationInput.apply(CreatePCollectionView.of(view));
+        return view;
+      }
+
+      PCollection<KV<Void, T>> materializationInput =
+          input.apply(new VoidKeyToMultimapMaterialization<>());
       Coder<T> inputCoder = input.getCoder();
-      PCollection<KV<Long, ValueOrMetadata<T, OffsetRange>>> materializationInput =
-          input
-              .apply("IndexElements", ParDo.of(new ToListViewDoFn<>()))
-              .setCoder(
-                  KvCoder.of(
-                      BigEndianLongCoder.of(),
-                      ValueOrMetadataCoder.create(inputCoder, OffsetRange.Coder.of())));
       PCollectionView<List<T>> view =
-          PCollectionViews.listView(
+          PCollectionViews.listViewUsingVoidKey(
               materializationInput,
               (TypeDescriptorSupplier<T>) inputCoder::getEncodedTypeDescriptor,
               materializationInput.getWindowingStrategy());
@@ -280,8 +300,8 @@
    * range for each window seen. We use random offset ranges to minimize the chance that two ranges
    * overlap increasing the odds that each "key" represents a single index.
    */
-  @Internal
-  public static class ToListViewDoFn<T> extends DoFn<T, KV<Long, ValueOrMetadata<T, OffsetRange>>> {
+  private static class ToListViewDoFn<T>
+      extends DoFn<T, KV<Long, ValueOrMetadata<T, OffsetRange>>> {
     private Map<BoundedWindow, OffsetRange> windowsToOffsets = new HashMap<>();
 
     private OffsetRange generateRange(BoundedWindow window) {
@@ -330,19 +350,29 @@
         throw new IllegalStateException("Unable to create a side-input view from input", e);
       }
 
+      // TODO(BEAM-10097): Make this the default expansion for all portable runners.
+      if (hasExperiment(input.getPipeline().getOptions(), "beam_fn_api")
+          && (hasExperiment(input.getPipeline().getOptions(), "use_runner_v2")
+              || hasExperiment(input.getPipeline().getOptions(), "use_unified_worker"))) {
+        Coder<T> inputCoder = input.getCoder();
+        PCollectionView<Iterable<T>> view =
+            PCollectionViews.iterableView(
+                input,
+                (TypeDescriptorSupplier<T>) inputCoder::getEncodedTypeDescriptor,
+                input.getWindowingStrategy());
+        input.apply(CreatePCollectionView.of(view));
+        return view;
+      }
+
+      PCollection<KV<Void, T>> materializationInput =
+          input.apply(new VoidKeyToMultimapMaterialization<>());
       Coder<T> inputCoder = input.getCoder();
-      // HACK to work around https://issues.apache.org/jira/browse/BEAM-12228:
-      // There are bugs in "composite" vs "primitive" transform distinction
-      // in TransformHierachy. This noop transform works around them and should be zero
-      // cost.
-      PCollection<T> materializationInput =
-          input.apply(MapElements.via(new SimpleFunction<T, T>(x -> x) {}));
       PCollectionView<Iterable<T>> view =
-          PCollectionViews.iterableView(
+          PCollectionViews.iterableViewUsingVoidKey(
               materializationInput,
               (TypeDescriptorSupplier<T>) inputCoder::getEncodedTypeDescriptor,
               materializationInput.getWindowingStrategy());
-      input.apply(CreatePCollectionView.of(view));
+      materializationInput.apply(CreatePCollectionView.of(view));
       return view;
     }
   }
@@ -478,22 +508,35 @@
         throw new IllegalStateException("Unable to create a side-input view from input", e);
       }
 
+      // TODO(BEAM-10097): Make this the default expansion for all portable runners.
+      if (hasExperiment(input.getPipeline().getOptions(), "beam_fn_api")
+          && (hasExperiment(input.getPipeline().getOptions(), "use_runner_v2")
+              || hasExperiment(input.getPipeline().getOptions(), "use_unified_worker"))) {
+        KvCoder<K, V> kvCoder = (KvCoder<K, V>) input.getCoder();
+        Coder<K> keyCoder = kvCoder.getKeyCoder();
+        Coder<V> valueCoder = kvCoder.getValueCoder();
+        PCollectionView<Map<K, Iterable<V>>> view =
+            PCollectionViews.multimapView(
+                input,
+                (TypeDescriptorSupplier<K>) keyCoder::getEncodedTypeDescriptor,
+                (TypeDescriptorSupplier<V>) valueCoder::getEncodedTypeDescriptor,
+                input.getWindowingStrategy());
+        input.apply(CreatePCollectionView.of(view));
+        return view;
+      }
+
       KvCoder<K, V> kvCoder = (KvCoder<K, V>) input.getCoder();
       Coder<K> keyCoder = kvCoder.getKeyCoder();
       Coder<V> valueCoder = kvCoder.getValueCoder();
-      // HACK to work around https://issues.apache.org/jira/browse/BEAM-12228:
-      // There are bugs in "composite" vs "primitive" transform distinction
-      // in TransformHierachy. This noop transform works around them and should be zero
-      // cost.
-      PCollection<KV<K, V>> materializationInput =
-          input.apply(MapElements.via(new SimpleFunction<KV<K, V>, KV<K, V>>(x -> x) {}));
+      PCollection<KV<Void, KV<K, V>>> materializationInput =
+          input.apply(new VoidKeyToMultimapMaterialization<>());
       PCollectionView<Map<K, Iterable<V>>> view =
-          PCollectionViews.multimapView(
+          PCollectionViews.multimapViewUsingVoidKey(
               materializationInput,
               (TypeDescriptorSupplier<K>) keyCoder::getEncodedTypeDescriptor,
               (TypeDescriptorSupplier<V>) valueCoder::getEncodedTypeDescriptor,
               materializationInput.getWindowingStrategy());
-      input.apply(CreatePCollectionView.of(view));
+      materializationInput.apply(CreatePCollectionView.of(view));
       return view;
     }
   }
@@ -524,19 +567,37 @@
         throw new IllegalStateException("Unable to create a side-input view from input", e);
       }
 
+      // TODO(BEAM-10097): Make this the default expansion for all portable runners.
+      if (hasExperiment(input.getPipeline().getOptions(), "beam_fn_api")
+          && (hasExperiment(input.getPipeline().getOptions(), "use_runner_v2")
+              || hasExperiment(input.getPipeline().getOptions(), "use_unified_worker"))) {
+        KvCoder<K, V> kvCoder = (KvCoder<K, V>) input.getCoder();
+        Coder<K> keyCoder = kvCoder.getKeyCoder();
+        Coder<V> valueCoder = kvCoder.getValueCoder();
+
+        PCollectionView<Map<K, V>> view =
+            PCollectionViews.mapView(
+                input,
+                (TypeDescriptorSupplier<K>) keyCoder::getEncodedTypeDescriptor,
+                (TypeDescriptorSupplier<V>) valueCoder::getEncodedTypeDescriptor,
+                input.getWindowingStrategy());
+        input.apply(CreatePCollectionView.of(view));
+        return view;
+      }
+
       KvCoder<K, V> kvCoder = (KvCoder<K, V>) input.getCoder();
       Coder<K> keyCoder = kvCoder.getKeyCoder();
       Coder<V> valueCoder = kvCoder.getValueCoder();
 
-      PCollection<KV<K, V>> materializationInput =
-          input.apply(MapElements.via(new SimpleFunction<KV<K, V>, KV<K, V>>(x -> x) {}));
+      PCollection<KV<Void, KV<K, V>>> materializationInput =
+          input.apply(new VoidKeyToMultimapMaterialization<>());
       PCollectionView<Map<K, V>> view =
-          PCollectionViews.mapView(
+          PCollectionViews.mapViewUsingVoidKey(
               materializationInput,
               (TypeDescriptorSupplier<K>) keyCoder::getEncodedTypeDescriptor,
               (TypeDescriptorSupplier<V>) valueCoder::getEncodedTypeDescriptor,
               materializationInput.getWindowingStrategy());
-      input.apply(CreatePCollectionView.of(view));
+      materializationInput.apply(CreatePCollectionView.of(view));
       return view;
     }
   }
@@ -545,11 +606,34 @@
   // Internal details below
 
   /**
+   * A {@link PTransform} which converts all values into {@link KV}s with {@link Void} keys.
+   *
+   * <p>TODO(BEAM-10097): Replace this materialization with specializations that optimize the
+   * various SDK requested views.
+   */
+  @Internal
+  public static class VoidKeyToMultimapMaterialization<T>
+      extends PTransform<PCollection<T>, PCollection<KV<Void, T>>> {
+
+    private static class VoidKeyToMultimapMaterializationDoFn<T> extends DoFn<T, KV<Void, T>> {
+      @ProcessElement
+      public void processElement(@Element T element, OutputReceiver<KV<Void, T>> r) {
+        r.output(KV.of((Void) null, element));
+      }
+    }
+
+    @Override
+    public PCollection<KV<Void, T>> expand(PCollection<T> input) {
+      PCollection output = input.apply(ParDo.of(new VoidKeyToMultimapMaterializationDoFn<>()));
+      output.setCoder(KvCoder.of(VoidCoder.of(), input.getCoder()));
+      return output;
+    }
+  }
+
+  /**
    * <b><i>For internal use only; no backwards-compatibility guarantees.</i></b>
    *
-   * <p>Placeholder transform for runners to have a hook to materialize a {@link PCollection} as a
-   * side input. The metadata included in the {@link PCollectionView} is how the {@link PCollection}
-   * will be read as a side input.
+   * <p>Creates a primitive {@link PCollectionView}.
    *
    * @param <ElemT> The type of the elements of the input PCollection
    * @param <ViewT> The type associated with the {@link PCollectionView} used as a side input
diff --git a/sdks/java/core/src/main/java/org/apache/beam/sdk/values/PCollectionViews.java b/sdks/java/core/src/main/java/org/apache/beam/sdk/values/PCollectionViews.java
index 360c1af..df88e21 100644
--- a/sdks/java/core/src/main/java/org/apache/beam/sdk/values/PCollectionViews.java
+++ b/sdks/java/core/src/main/java/org/apache/beam/sdk/values/PCollectionViews.java
@@ -120,7 +120,6 @@
    */
   @Deprecated
   public static <T, W extends BoundedWindow> PCollectionView<T> singletonViewUsingVoidKey(
-      TupleTag<MultimapView<Void, T>> tag,
       PCollection<KV<Void, T>> pCollection,
       TypeDescriptorSupplier<T> typeDescriptorSupplier,
       WindowingStrategy<?, W> windowingStrategy,
@@ -129,7 +128,6 @@
       Coder<T> defaultValueCoder) {
     return new SimplePCollectionView<>(
         pCollection,
-        tag,
         new SingletonViewFn<>(hasDefault, defaultValue, defaultValueCoder, typeDescriptorSupplier),
         windowingStrategy.getWindowFn().getDefaultWindowMappingFn(),
         windowingStrategy);
@@ -158,13 +156,11 @@
    */
   @Deprecated
   public static <T, W extends BoundedWindow> PCollectionView<Iterable<T>> iterableViewUsingVoidKey(
-      TupleTag<MultimapView<Void, T>> tag,
       PCollection<KV<Void, T>> pCollection,
       TypeDescriptorSupplier<T> typeDescriptorSupplier,
       WindowingStrategy<?, W> windowingStrategy) {
     return new SimplePCollectionView<>(
         pCollection,
-        tag,
         new IterableViewFn<>(typeDescriptorSupplier),
         windowingStrategy.getWindowFn().getDefaultWindowMappingFn(),
         windowingStrategy);
@@ -188,35 +184,16 @@
   /**
    * Returns a {@code PCollectionView<List<T>>} capable of processing elements windowed using the
    * provided {@link WindowingStrategy}.
-   */
-  public static <T, W extends BoundedWindow> PCollectionView<List<T>> listView(
-      PCollection<KV<Long, ValueOrMetadata<T, OffsetRange>>> pCollection,
-      TupleTag<Materializations.MultimapView<Long, ValueOrMetadata<T, OffsetRange>>> tag,
-      TypeDescriptorSupplier<T> typeDescriptorSupplier,
-      WindowingStrategy<?, W> windowingStrategy) {
-    return new SimplePCollectionView<>(
-        pCollection,
-        tag,
-        new ListViewFn2<>(typeDescriptorSupplier),
-        windowingStrategy.getWindowFn().getDefaultWindowMappingFn(),
-        windowingStrategy);
-  }
-
-  /**
-   * Returns a {@code PCollectionView<List<T>>} capable of processing elements windowed using the
-   * provided {@link WindowingStrategy}.
    *
    * @deprecated See {@link #listView}.
    */
   @Deprecated
   public static <T, W extends BoundedWindow> PCollectionView<List<T>> listViewUsingVoidKey(
-      TupleTag<MultimapView<Void, T>> tag,
       PCollection<KV<Void, T>> pCollection,
       TypeDescriptorSupplier<T> typeDescriptorSupplier,
       WindowingStrategy<?, W> windowingStrategy) {
     return new SimplePCollectionView<>(
         pCollection,
-        tag,
         new ListViewFn<>(typeDescriptorSupplier),
         windowingStrategy.getWindowFn().getDefaultWindowMappingFn(),
         windowingStrategy);
@@ -266,14 +243,12 @@
    */
   @Deprecated
   public static <K, V, W extends BoundedWindow> PCollectionView<Map<K, V>> mapViewUsingVoidKey(
-      TupleTag<MultimapView<Void, KV<K, V>>> tag,
       PCollection<KV<Void, KV<K, V>>> pCollection,
       TypeDescriptorSupplier<K> keyTypeDescriptorSupplier,
       TypeDescriptorSupplier<V> valueTypeDescriptorSupplier,
       WindowingStrategy<?, W> windowingStrategy) {
     return new SimplePCollectionView<>(
         pCollection,
-        tag,
         new MapViewFn<>(keyTypeDescriptorSupplier, valueTypeDescriptorSupplier),
         windowingStrategy.getWindowFn().getDefaultWindowMappingFn(),
         windowingStrategy);
@@ -304,14 +279,12 @@
   @Deprecated
   public static <K, V, W extends BoundedWindow>
       PCollectionView<Map<K, Iterable<V>>> multimapViewUsingVoidKey(
-          TupleTag<MultimapView<Void, KV<K, V>>> tag,
           PCollection<KV<Void, KV<K, V>>> pCollection,
           TypeDescriptorSupplier<K> keyTypeDescriptorSupplier,
           TypeDescriptorSupplier<V> valueTypeDescriptorSupplier,
           WindowingStrategy<?, W> windowingStrategy) {
     return new SimplePCollectionView<>(
         pCollection,
-        tag,
         new MultimapViewFn<>(keyTypeDescriptorSupplier, valueTypeDescriptorSupplier),
         windowingStrategy.getWindowFn().getDefaultWindowMappingFn(),
         windowingStrategy);
@@ -339,9 +312,7 @@
    * <p>{@link SingletonViewFn} is meant to be removed in the future and replaced with this class.
    */
   @Experimental(Kind.CORE_RUNNERS_ONLY)
-  @Internal
-  public static class SingletonViewFn2<T> extends ViewFn<IterableView<T>, T>
-      implements HasDefaultValue<T> {
+  private static class SingletonViewFn2<T> extends ViewFn<IterableView<T>, T> {
     private byte @Nullable [] encodedDefaultValue;
     private transient @Nullable T defaultValue;
     private @Nullable Coder<T> valueCoder;
@@ -379,7 +350,6 @@
      *
      * @throws NoSuchElementException if no default was specified.
      */
-    @Override
     public T getDefaultValue() {
       if (!hasDefault) {
         throw new NoSuchElementException("Empty PCollection accessed as a singleton view.");
@@ -423,11 +393,6 @@
     }
   }
 
-  @Internal
-  public interface HasDefaultValue<T> {
-    T getDefaultValue();
-  }
-
   /**
    * Implementation which is able to adapt a multimap materialization to a {@code T}.
    *
@@ -437,8 +402,7 @@
    */
   @Deprecated
   @Experimental(Kind.CORE_RUNNERS_ONLY)
-  public static class SingletonViewFn<T> extends ViewFn<MultimapView<Void, T>, T>
-      implements HasDefaultValue<T> {
+  public static class SingletonViewFn<T> extends ViewFn<MultimapView<Void, T>, T> {
     private byte @Nullable [] encodedDefaultValue;
     private transient @Nullable T defaultValue;
     private @Nullable Coder<T> valueCoder;
@@ -476,7 +440,6 @@
      *
      * @throws NoSuchElementException if no default was specified.
      */
-    @Override
     public T getDefaultValue() {
       if (!hasDefault) {
         throw new NoSuchElementException("Empty PCollection accessed as a singleton view.");
@@ -530,8 +493,7 @@
    * <p>{@link IterableViewFn} is meant to be removed in the future and replaced with this class.
    */
   @Experimental(Kind.CORE_RUNNERS_ONLY)
-  @Internal
-  public static class IterableViewFn2<T> extends ViewFn<IterableView<T>, Iterable<T>> {
+  private static class IterableViewFn2<T> extends ViewFn<IterableView<T>, Iterable<T>> {
     private TypeDescriptorSupplier<T> typeDescriptorSupplier;
 
     public IterableViewFn2(TypeDescriptorSupplier<T> typeDescriptorSupplier) {
@@ -597,7 +559,7 @@
    */
   @Experimental(Kind.CORE_RUNNERS_ONLY)
   @VisibleForTesting
-  public static class ListViewFn2<T>
+  static class ListViewFn2<T>
       extends ViewFn<MultimapView<Long, ValueOrMetadata<T, OffsetRange>>, List<T>> {
     private TypeDescriptorSupplier<T> typeDescriptorSupplier;
 
@@ -1041,8 +1003,7 @@
    * <p>{@link MultimapViewFn} is meant to be removed in the future and replaced with this class.
    */
   @Experimental(Kind.CORE_RUNNERS_ONLY)
-  @Internal
-  public static class MultimapViewFn2<K, V>
+  private static class MultimapViewFn2<K, V>
       extends ViewFn<MultimapView<K, V>, Map<K, Iterable<V>>> {
     private TypeDescriptorSupplier<K> keyTypeDescriptorSupplier;
     private TypeDescriptorSupplier<V> valueTypeDescriptorSupplier;
@@ -1130,8 +1091,7 @@
    *
    * <p>{@link MapViewFn} is meant to be removed in the future and replaced with this class.
    */
-  @Internal
-  public static class MapViewFn2<K, V> extends ViewFn<MultimapView<K, V>, Map<K, V>> {
+  private static class MapViewFn2<K, V> extends ViewFn<MultimapView<K, V>, Map<K, V>> {
     private TypeDescriptorSupplier<K> keyTypeDescriptorSupplier;
     private TypeDescriptorSupplier<V> valueTypeDescriptorSupplier;
 
@@ -1319,13 +1279,7 @@
 
     @Override
     public String toString() {
-      return MoreObjects.toStringHelper(this)
-          .add("tag", tag)
-          .add("viewFn", viewFn)
-          .add("coder", coder)
-          .add("windowMappingFn", windowMappingFn)
-          .add("pCollection", pCollection)
-          .toString();
+      return MoreObjects.toStringHelper(this).add("tag", tag).toString();
     }
 
     @Override
diff --git a/sdks/java/core/src/test/java/org/apache/beam/sdk/testing/PCollectionViewTesting.java b/sdks/java/core/src/test/java/org/apache/beam/sdk/testing/PCollectionViewTesting.java
index 61b4bf8..b340d91 100644
--- a/sdks/java/core/src/test/java/org/apache/beam/sdk/testing/PCollectionViewTesting.java
+++ b/sdks/java/core/src/test/java/org/apache/beam/sdk/testing/PCollectionViewTesting.java
@@ -17,6 +17,8 @@
  */
 package org.apache.beam.sdk.testing;
 
+import static org.apache.beam.sdk.options.ExperimentalOptions.hasExperiment;
+
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -40,42 +42,82 @@
     // materializations will differ but test code should not worry about what these look like if
     // they are relying on the ViewFn to "undo" the conversion.
 
-    if (View.AsSingleton.class.equals(viewTransformClass.getClass())) {
-      for (Object value : values) {
-        rval.add(value);
-      }
-    } else if (View.AsIterable.class.equals(viewTransformClass.getClass())) {
-      for (Object value : values) {
-        rval.add(value);
-      }
-    } else if (View.AsList.class.equals(viewTransformClass.getClass())) {
-      if (values.length > 0) {
-        rval.add(
-            KV.of(
-                Long.MIN_VALUE, ValueOrMetadata.createMetadata(new OffsetRange(0, values.length))));
-        for (int i = 0; i < values.length; ++i) {
-          rval.add(KV.of((long) i, ValueOrMetadata.create(values[i])));
+    // TODO(BEAM-10097): Make this the default case once all portable runners can support
+    // the iterable access pattern.
+    if (hasExperiment(options, "beam_fn_api")
+        && (hasExperiment(options, "use_runner_v2")
+            || hasExperiment(options, "use_unified_worker"))) {
+      if (View.AsSingleton.class.equals(viewTransformClass.getClass())) {
+        for (Object value : values) {
+          rval.add(value);
         }
-      }
-    } else if (View.AsMap.class.equals(viewTransformClass.getClass())) {
-      for (Object value : values) {
-        rval.add(value);
-      }
-    } else if (View.AsMultimap.class.equals(viewTransformClass.getClass())) {
-      for (Object value : values) {
-        rval.add(value);
+      } else if (View.AsIterable.class.equals(viewTransformClass.getClass())) {
+        for (Object value : values) {
+          rval.add(value);
+        }
+      } else if (View.AsList.class.equals(viewTransformClass.getClass())) {
+        if (values.length > 0) {
+          rval.add(
+              KV.of(
+                  Long.MIN_VALUE,
+                  ValueOrMetadata.createMetadata(new OffsetRange(0, values.length))));
+          for (int i = 0; i < values.length; ++i) {
+            rval.add(KV.of((long) i, ValueOrMetadata.create(values[i])));
+          }
+        }
+      } else if (View.AsMap.class.equals(viewTransformClass.getClass())) {
+        for (Object value : values) {
+          rval.add(value);
+        }
+      } else if (View.AsMultimap.class.equals(viewTransformClass.getClass())) {
+        for (Object value : values) {
+          rval.add(value);
+        }
+      } else {
+        throw new IllegalArgumentException(
+            String.format(
+                "Unknown type of view %s. Supported views are %s.",
+                viewTransformClass.getClass(),
+                ImmutableSet.of(
+                    View.AsSingleton.class,
+                    View.AsIterable.class,
+                    View.AsList.class,
+                    View.AsMap.class,
+                    View.AsMultimap.class)));
       }
     } else {
-      throw new IllegalArgumentException(
-          String.format(
-              "Unknown type of view %s. Supported views are %s.",
-              viewTransformClass.getClass(),
-              ImmutableSet.of(
-                  View.AsSingleton.class,
-                  View.AsIterable.class,
-                  View.AsList.class,
-                  View.AsMap.class,
-                  View.AsMultimap.class)));
+      if (View.AsSingleton.class.equals(viewTransformClass.getClass())) {
+        for (Object value : values) {
+          rval.add(KV.of(null, value));
+        }
+      } else if (View.AsIterable.class.equals(viewTransformClass.getClass())) {
+        for (Object value : values) {
+          rval.add(KV.of(null, value));
+        }
+      } else if (View.AsList.class.equals(viewTransformClass.getClass())) {
+        for (Object value : values) {
+          rval.add(KV.of(null, value));
+        }
+      } else if (View.AsMap.class.equals(viewTransformClass.getClass())) {
+        for (Object value : values) {
+          rval.add(KV.of(null, value));
+        }
+      } else if (View.AsMultimap.class.equals(viewTransformClass.getClass())) {
+        for (Object value : values) {
+          rval.add(KV.of(null, value));
+        }
+      } else {
+        throw new IllegalArgumentException(
+            String.format(
+                "Unknown type of view %s. Supported views are %s.",
+                viewTransformClass.getClass(),
+                ImmutableSet.of(
+                    View.AsSingleton.class,
+                    View.AsIterable.class,
+                    View.AsList.class,
+                    View.AsMap.class,
+                    View.AsMultimap.class)));
+      }
     }
     return Collections.unmodifiableList(rval);
   }
diff --git a/sdks/python/apache_beam/testing/load_tests/load_test_metrics_utils.py b/sdks/python/apache_beam/testing/load_tests/load_test_metrics_utils.py
index 68139cf..f6d3340 100644
--- a/sdks/python/apache_beam/testing/load_tests/load_test_metrics_utils.py
+++ b/sdks/python/apache_beam/testing/load_tests/load_test_metrics_utils.py
@@ -48,7 +48,7 @@
 from apache_beam.utils.timestamp import Timestamp
 
 try:
-  from google.cloud import bigquery
+  from google.cloud import bigquery  # type: ignore
   from google.cloud.bigquery.schema import SchemaField
   from google.cloud.exceptions import NotFound
 except ImportError: