I've never seen anybody use fullscreen-apps/spaces/maximized-windows smoothly, ever.

It's especially bad on multi-monitor.

  - New windows appear on unfocused monitor at random.
  - Can make shortcuts to spaces, but not the fullscreen-apps (which look like spaces to all other effects). There are apps to make shortcuts to apps, but this is useless if you have e.g. two terminals in fullscreen mode, it just targets one window at random.
  - Cannot deactivate the slow change-space aninmation.
  - Windows are grouped under same app in Alt-Tab list.
  - When fullscreen-app, some dialogs do overlay the app, some are hidden on some random space, and some forcefully move your active space. At random.
  - Plugging and unplugging monitors frequently wreaks havoc among the window disposition.