I'm sure Steve would delight in the Apple ecosystem being as difficult to leave once you've committed to it fully, but hate how overdesigned macOS and iOS are at the expense of the user experience.
Insert helloSystem documentation here.
Discussion
I think iOS is very well designed!
This thread is doing a good job of highlighting how hard it is to please everyone :)
From a UI point of view, iOS is very well designed and has had years of polish from the overly flat iOS 7 to find the balance between minimalism and skeuomorphism.
The UX, however, has only gotten worse since Jobs' passing due to the prioritization of surface-level simplicity over genuinel simplification of complex computing tasks.
Just scroll down to the "Links" part to read Richard Mori's articles, if you'd rather not read additional fluff.