> I talk with iOS devs often, and most of them do not use SwiftUI because the feature disparity is massive across iOS releases. Bundling features into the Android SDK would be about 1000 times worse because Android OEMs don't update their devices like Apple does.

That's largely due to SwiftUI's newness and immaturity, though. Although UIKit gets major new additions each year it doesn't have that problem because all of the essentials have been in place for ages, which means when supporting older releases you can either just use the older APIs or use a combination of old and new with conditionals.