I'm guilty of many of these. The reason is screen real estate. You want to have the most essential stuff on the screen, and not in hidden menus or popup window

I'm guilty of many of these. The reason is screen real estate. You want to have the most essential stuff on the screen, and not in hidden menus or popup windows. And your app needs to adapt to many screen sizes, all from mobile, pad's, notebooks to desktop monitors. Then it's much more efficient to use the keyboard rather then reaching for the mouse to click on icons you have no idea what they mean, or pulling on scrollbars. Only problem is that if you design your app like Vim, you will have to put a lot of time into teaching users to use it properly.