Apple prides itself on building high quality user experiences. One can argue over whether that’s true anymore or ever was but it’s very clear they pride themselves on that. This is why Apple tends to “be late” on many features. I think like you’re saying it’s becoming even more clear they aren’t seeing a UX they are willing to ship to customers. We’ll see with WWDC if they found something in the last year to make it better but this paper seems to indicate they haven’t.