That is needed complexity though. Drawing pixels on the screen is very simple when you have exactly one application using the screen. Nobody want to quit the

That is needed complexity though. Drawing pixels on the screen is very simple when you have exactly one application using the screen. Nobody want to quit the word processor to open their email client. Nobody wants to miss a meeting notice because they were writing code in their editor and thus didn't have their calendar open. Hard core emacs users can live in one application all day, but most people want to run more than once application at a time and have them all work on a screen. Thus complexity is required.