With Android, it's not so much that Google does it out of choice but because they have no control of most of the phones and there were (still are?) huge numbers

With Android, it's not so much that Google does it out of choice but because they have no control of most of the phones and there were (still are?) huge numbers of phones which don't even have access to OS updates or get them very late. Google was forced to pull a lot of functionality out of the OS level to be able to keep people up to date.