diff --git a/servicetalk-loadbalancer-experimental/src/main/java/io/servicetalk/loadbalancer/DefaultLoadBalancerBuilder.java b/servicetalk-loadbalancer-experimental/src/main/java/io/servicetalk/loadbalancer/DefaultLoadBalancerBuilder.java
index e17e76d357..d7612ed3b4 100644
--- a/servicetalk-loadbalancer-experimental/src/main/java/io/servicetalk/loadbalancer/DefaultLoadBalancerBuilder.java
+++ b/servicetalk-loadbalancer-experimental/src/main/java/io/servicetalk/loadbalancer/DefaultLoadBalancerBuilder.java
@@ -56,12 +56,6 @@ public LoadBalancerBuilder<ResolvedAddress, C> loadBalancingPolicy(
         return this;
     }
 
-    @Override
-    public LoadBalancerBuilder<ResolvedAddress, C> loadBalancerObserver(
-            @Nullable LoadBalancerObserver loadBalancerObserver) {
-        return loadBalancerObserver(loadBalancerObserver == null ? null : ignored -> loadBalancerObserver);
-    }
-
     @Override
     public LoadBalancerBuilder<ResolvedAddress, C> loadBalancerObserver(
             @Nullable LoadBalancerObserverFactory loadBalancerObserverFactory) {
diff --git a/servicetalk-loadbalancer-experimental/src/main/java/io/servicetalk/loadbalancer/DelegatingLoadBalancerBuilder.java b/servicetalk-loadbalancer-experimental/src/main/java/io/servicetalk/loadbalancer/DelegatingLoadBalancerBuilder.java
index 5d1785ac17..9c03314021 100644
--- a/servicetalk-loadbalancer-experimental/src/main/java/io/servicetalk/loadbalancer/DelegatingLoadBalancerBuilder.java
+++ b/servicetalk-loadbalancer-experimental/src/main/java/io/servicetalk/loadbalancer/DelegatingLoadBalancerBuilder.java
@@ -59,13 +59,6 @@ public LoadBalancerBuilder<ResolvedAddress, C> loadBalancingPolicy(
         return this;
     }
 
-    @Override
-    public LoadBalancerBuilder<ResolvedAddress, C> loadBalancerObserver(
-            @Nullable LoadBalancerObserver loadBalancerObserver) {
-        delegate = delegate.loadBalancerObserver(loadBalancerObserver);
-        return this;
-    }
-
     @Override
     public LoadBalancerBuilder<ResolvedAddress, C> loadBalancerObserver(
             @Nullable LoadBalancerObserverFactory loadBalancerObserverFactory) {
diff --git a/servicetalk-loadbalancer-experimental/src/main/java/io/servicetalk/loadbalancer/LoadBalancerBuilder.java b/servicetalk-loadbalancer-experimental/src/main/java/io/servicetalk/loadbalancer/LoadBalancerBuilder.java
index 3a8a478d99..1613018ea0 100644
--- a/servicetalk-loadbalancer-experimental/src/main/java/io/servicetalk/loadbalancer/LoadBalancerBuilder.java
+++ b/servicetalk-loadbalancer-experimental/src/main/java/io/servicetalk/loadbalancer/LoadBalancerBuilder.java
@@ -70,27 +70,14 @@ public interface LoadBalancerBuilder<ResolvedAddress, C extends LoadBalancedConn
     LoadBalancerBuilder<ResolvedAddress, C> loadBalancingPolicy(
             LoadBalancingPolicy<ResolvedAddress, C> loadBalancingPolicy);
 
-    /**
-     * Set the {@link LoadBalancerObserver} to use with this load balancer.
-     * @param loadBalancerObserver the {@link LoadBalancerObserver} to use, or {@code null} to not use an observer.
-     * @return {code this}
-     * @deprecated use the overload that takes a {@link LoadBalancerObserverFactory}
-     */
-    @Deprecated // TODO: remove deprecated method after 0.42.46 release.
-    LoadBalancerBuilder<ResolvedAddress, C> loadBalancerObserver(@Nullable LoadBalancerObserver loadBalancerObserver);
-
     /**
      * Set the {@link LoadBalancerObserverFactory} to use with this load balancer.
      * @param loadBalancerObserverFactory the {@link LoadBalancerObserverFactory} to use, or {@code null} to not use an
      *                                    observer.
      * @return {code this}
      */
-    // TODO: remove the default implementation after 0.42.46 release.
-    default LoadBalancerBuilder<ResolvedAddress, C> loadBalancerObserver(
-            @Nullable LoadBalancerObserverFactory loadBalancerObserverFactory) {
-        return loadBalancerObserver(loadBalancerObserverFactory == null ? null
-                : loadBalancerObserverFactory.newObserver("<unknown>"));
-    }
+    LoadBalancerBuilder<ResolvedAddress, C> loadBalancerObserver(
+            @Nullable LoadBalancerObserverFactory loadBalancerObserverFactory);
 
     /**
      * Set the {@link OutlierDetectorConfig} to use with this load balancer.
diff --git a/servicetalk-loadbalancer-experimental/src/main/java/io/servicetalk/loadbalancer/LoadBalancerPolicies.java b/servicetalk-loadbalancer-experimental/src/main/java/io/servicetalk/loadbalancer/LoadBalancerPolicies.java
deleted file mode 100644
index 980ade1867..0000000000
--- a/servicetalk-loadbalancer-experimental/src/main/java/io/servicetalk/loadbalancer/LoadBalancerPolicies.java
+++ /dev/null
@@ -1,50 +0,0 @@
-/*
- * Copyright © 2023 Apple Inc. and the ServiceTalk project authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package io.servicetalk.loadbalancer;
-
-/**
- * A collections of factories for constructing a {@link LoadBalancingPolicy}.
- * @deprecated use {@link LoadBalancingPolicies}.
- */
-@Deprecated // TODO: remove after 0.42.46 release.
-public final class LoadBalancerPolicies {
-
-    private LoadBalancerPolicies() {
-        // no instances.
-    }
-
-    /**
-     * Builder for the round-robin {@link LoadBalancingPolicy}.
-     * Round-robin load balancing is a strategy that maximizes fairness of the request distribution. This comes at the
-     * cost of being unable to bias toward better performing hosts and can only leverage the course grained
-     * healthy/unhealthy status of a host.
-     * @return a builder for the round-robin {@link LoadBalancingPolicy}.
-     */
-    public static RoundRobinLoadBalancingPolicyBuilder roundRobin() {
-        return new RoundRobinLoadBalancingPolicyBuilder();
-    }
-
-    /**
-     * Builder for the power of two choices (P2C) {@link LoadBalancingPolicy}.
-     * Power of Two Choices (P2C) leverages both course grained healthy/unhealthy status of a host plus additional
-     * fine-grained scoring to prioritize hosts that are both healthy and better performing. See the
-     * {@link P2CLoadBalancingPolicy} for more details.
-     * @return a builder for the power of two choices (P2C) {@link LoadBalancingPolicy}.
-     */
-    public static P2CLoadBalancingPolicyBuilder p2c() {
-        return new P2CLoadBalancingPolicyBuilder();
-    }
-}
diff --git a/servicetalk-loadbalancer-experimental/src/test/java/io/servicetalk/loadbalancer/RoundRobinLoadBalancerBuilderAdapter.java b/servicetalk-loadbalancer-experimental/src/test/java/io/servicetalk/loadbalancer/RoundRobinLoadBalancerBuilderAdapter.java
index 32c933ae56..db20dd3ad8 100644
--- a/servicetalk-loadbalancer-experimental/src/test/java/io/servicetalk/loadbalancer/RoundRobinLoadBalancerBuilderAdapter.java
+++ b/servicetalk-loadbalancer-experimental/src/test/java/io/servicetalk/loadbalancer/RoundRobinLoadBalancerBuilderAdapter.java
@@ -38,7 +38,7 @@ public LoadBalancerBuilder<String, TestLoadBalancedConnection> loadBalancingPoli
 
     @Override
     public LoadBalancerBuilder<String, TestLoadBalancedConnection> loadBalancerObserver(
-            @Nullable LoadBalancerObserver loadBalancerObserver) {
+            @Nullable LoadBalancerObserverFactory loadBalancerObserverFactory) {
         throw new IllegalStateException("Cannot set a load balancer observer for old round robin");
     }