Comment by kccqzy

Users' expectation changes. You ask someone who grew up with Windows 98 and they will tell you that d'oh of course onscreen buttons should have a depressed state to indicate they are pressed. You ask someone who grew up with Snapchat and the entire idea of having buttons is optional: tap on this area of the screen for this functionality, tap on that area for a different functionality, and swipe left for this swipe right for that with no indication that the UI is even swipeable.