I agree that it’s a mark of shame that he left voluntarily, but I do think a lot of this traces back to Apple being more of a hardware company at heart. Jony Ive pulled off some industrial design which looked really nice and I think his history there meant that when he promoted the packaging designer to be in charge of UI people gave it too much credence, forgetting that Jony Ive also wasn’t experienced in that area and, as the history of UX botches shows, was about as good at it as a software developer would be at winging hardware design. People who’ve been successful at one thing just aren’t guaranteed to be successful somewhere else and loyalty to the company shouldn’t overshadow that.