[btym]

>The actual issue is that Windows and Linux don't properly use a ‘super’ key―while the ‘Win’ key is sitting there uselessly.

>These keys are great to use on Mac

The use of the super key on Mac is horrible. It should sit there uselessly, until I tell it to do otherwise. On Mac, here are no safe hotkeys to bind anything to. On Linux, my WM configuration has a ton of actions bound to the super key, and I never have to worry that it will conflict with another application.