And then the designers came and threw away so much of that knowledge because they wanted to make something that looks good in screenshots. Visible controls are ugly they said, so all buttons and controls get hidden away under some nondescript icon that doesn't even look like an interactive element (maybe 3 lines in the corner or something). Scrollbars are uncool so now they disappear immediately and you just have to know where to look for them. White space is visually pleasing so just fill the screen with it. Old rules about making buttons look like buttons are completely ignored so the screenshot is pretty. Sure you have to hunt around like a blind person in an alley trying to make things actually work, but it sure looks nice doesn't it?