And part of my point is precisely that in the subsequent rewrite, the OS-level specialness of Apple is now essentially gone. (Apple itself of course has a distinct identity.) While I do not necessarily believe where we are today is completely inevitable, I do also tend to think that it's an awfully strong local optima. (People often come up with radical ideas for alternate approaches but IMHO have a hard time proving alternate approaches are generally better, as opposed to better for a very particular use case.)