Probably iOS 7 or shortly after. They murdered what had been hands-down the best UI for non-nerds of any OS I've ever seen, with that version. Lots of "buttons"

Probably iOS 7 or shortly after. They murdered what had been hands-down the best UI for non-nerds of any OS I've ever seen, with that version. Lots of "buttons" that were just text and other terrible flat-UI garbage. They undid some of that since, but it's still not back to being as good as 6 was.