The missing piece of Apple's "hegemony" in its own ecosystem: Web Search. They still depend on Google, and it's surprising to me that they don't seem to care that much.
This makes it at odds with Apple’s emphasis on privacy. (See Siri for another example of a service that’s hindered by Apple’s privacy standards).
[1] Many people will argue DuckDuckGo is okay, but by ‘right’ I mean competing with Google for the top slot for the everyday search user.