Hmm, isn't that "just" a tiling window manager at the bottom of a few other nice things? https://en.wikipedia.org/wiki/Tiling_window_manager While feeling the shortcomings of a window system, I never felt like I could productively work with a tiling manager, since I frequently overlap windows as a mechanism for easy access ... and there are lots of popup windows I don't want to cover the main application. Oh yes, and…
Part of the idea of most tiling window managers is that you use the keyboard to control them, not the mouse. As such, you no longer need to overlap windows to quickly switch to the one you want. You have keybinds to do so (which actually exist in the default Windows and OSX window manager as well.)