[NOGDP]

Eh, that's a lot of extra steps and complexity for no apparent reason. Virtual desktops, supported by many linux UXs for a long time, provide essentially all of the same functionality without the extra mental overhead of having to deal with 'mission control' and thinking about monitor vs space vs window, or thinking about 'which state is my window in?'.

> You can't drag a fullscreen window from one monitor to another, because there's no window for you to drag.

But you do get the window bar on hover, which is the same 'control' you use for dragging non-fullscreen windows... the fullscreen window is still a window, except it's controls have been restricted and behaviour modified to prevent it from acting as a window for no apparent reason. The way this concept is implemented in macOS is just ugly imo.