That's what you would expect from the App Store as well, since why change a dynamic library when the code-controlling developer can just build a new version wit

That's what you would expect from the App Store as well, since why change a dynamic library when the code-controlling developer can just build a new version with his own code when the developer wants to update the app. Injecting new (the nature of not being available on app-submission) framework versions on the developers' behalf would be scary, since these versions weren't tested with the app because the versions did not exist before. As you said, ABI compat is impossible when no one cares about that much.