[breather]

I mean yea, but in practice I run into frustration that the terminal doesn't have a key dedicated to commands far more than I need to do something globally.

Anyway, you can use cmd, you just need to have an actual command (non-modifier-key) to pass it—I have no use for a key that does one thing.

[sunshowers]

The problem is that many apps on macOS use Cmd + one or more other modifiers for their own shortcuts. On Linux at least, no apps that I know of use Super in any shortcuts.