I have an iPhone (forced upon me by work) and it's ridiculous how many links still try to open in safari or Apple maps. I've tried to configure it for years and I've literally uninstalled Apple maps, but half the time iPhone keeps wanting me to reinstall it when I click a link or address. And a lot of url links open in safari instead of chrome or Firefox.
Same with many other things - I can install whatever browser I want as long as it's a skin on their browser.
I can install any keyboard I want as long as it's just a skin on their keyboard.
I can install any app I want as long as it comes from Apple store.
Etc etc etc.
Yep, I vehemently disagree with your premise :). I think MS is looking at Apple's walled garden and saying "what if we could get away with some of that?"
(not disagreeing that dark patterns are despicable! My wife knows the scream that comes from my home office when I try to get iPhone or windows to do something I want! I just disagree that mobile os world is some paragon of user centric benevolence :)