It was probably a cascade of people but the question is whether we all realize Apple was right or if they just implemented it wrong or if it will just take a year or two to get things dialed in (but still prepared for an AR/VR world) and then we forget it ever happened.
People had the same reaction to iOS 7. They cleaned up some of the excesses over the next few years, and now the same basic concept is what people want Apple to RETURN to. They'll be fine.
I’d still want Apple to return to an iOS 6-like design. Not the super-skeuomorphic stuff, but the regular UI with discernible controls clearly separated from content.
It's a leadership failure. They obviously have a UI/UX dept. Those people want to be considered productive. Hence, they need to force a major redesign every now and then. Without a Steve Jobs like leader, those things will happen due to fundamental laws of corporate bureaucracy.
You remember the funny turn of phrase instead of how bad the reception was in your iPhone 4, and how it ruined the experience of owning it. Because it wasn't that big of a deal in the end.