Combined with Apple's love of walled gardens (and therefore very limited interoperability with other platforms), switching out would cause too much friction.
Similar to how while I can buy my parents new Android phones as upgrades, they'll just go back to the old ones if they can't have the old school navigation bar they're used to. Unlike me they're no longer willing to relearn how everything works every few years.
It's always kind of annoying seeing this "just don't use it" argument, as it completely ignores that part of the point of the walled garden is that it gradually forces people to be so invested in the garden that it becomes increasingly expensive to leave it. It's a similar network effect as what keeps abusive platforms like YouTube alive despite no one really liking it.
