I generally prefer a 4:3 ratio screen for non-video stuff, and I really like portrait displays (which is where 4:3, or rather 3:4, really shines) for reading/writing, etc. It means you get more text in a single screen. Heck, you get more text in a single screen in 4:3 than you do in 16:9 (since you sacrifice vertical resolution for horizontal). That’s great for things like video that should be optimized for horizontal display (because human vision is) but is terrible for things like code (a lot of wasted horizontal space, and it shows less code because it sacrificed vertical resolution vs a 4:3 monitor of the same pixel density and screen size) and does a terrible job emulating reading. 16:9 in portrait is really too narrow to do anything with at 100%, too. Maybe Apple could offer an iPad Video Pro with a 16:9 ratio for 4k video editing, but, for everything else, I’d favor 4:3 on a tablet.