When considering UI changes, it's worth thinking how people use your app. Some apps are used only occasionally, so that effectively everyone is a beginner ever

When considering UI changes, it's worth thinking how people use your app. Some apps are used only occasionally, so that effectively everyone is a beginner every time. In this case, there's room for rapid UI evolution and improvement. Other apps are deeper and more feature rich and will be used by a given person for hours each day. You'll have to be very careful in changing these apps if you don't want irate users.