On an unrelated note, I use Time Machine and I’m surprised at how unpolished, not to say downright buggy, all the animations are. They used to look magical, but now they are a mess of elements popping on and off and things moving and then vanishing the next frame and so on. It looks like they kept changing Finder and Time Machine didn’t keep up; they kept fixing the bare minimum to have it compile and nothing more.
It's like that because people are still buying. Even for the ridiculous prices Apple asks for.
So why would Apple actually care? They get away with this "quality", so from a business standpoint there is simply nothing that needs investments or even just attention.
It's a race to the bottom. Like everywhere else. That's simply how the system which people created works.