Consistency has been on the decline within Apple apps for sure, but it gets much worse after introducing cross platform apps into the mix.

The main one I end up missing most is the swipe to go back gesture within apps. It comes for “free” when using UIKit and SwiftUI navigation primitives (UINavigationController, UISplitViewController, and their SwiftUI counterparts) but it’s almost always missing from apps built with React Native and such.