The thing that keeps me on Linux (mostly), is the ability to use alt+drag (I actually re-bind this to Win+drag) to move and resize windows without having to move my mouse to the title bar, or to the thin edges of the windows.

I can just use alt+left drag to move my window, a large target, anywhere I want it to, and likewise to resize it.

It's really annoying for me when I have to use a Windows VM (for example), and not be able to do this.