Apple achieved it with Mac OS X Snow Leopard. Apple then spent ~15 years un-achieving it. It started with iOS 7, and has culminated in the Liquid (Gl)ass era: a mess of unintuitive menus, terrible and inconsistent UI patterns, the lobotomite twins Siri & Apple Intelligence.
Although, surprisingly, built on top of absolutely incredible silicon.
It has posix shell, all is forgiven, can't complain about UI patterns that I never interact with.
> Although, surprisingly, built on top of absolutely incredible silicon.
To me that's because thats a capital E "Engineering" driven task that Product can't get their grubby little mitts on and ruin.