Daily desktop use; I’d like to eliminate the repetitive stress and time it takes to move my hands off the home row, use a pointing device, and re-acquire the home row.
Also, I think Factorio would be fantastic if I could use both hands for hotkeys.
Headsets are probably not going top work for what I’d like to accomplish; a remote bar-style (some look little more than web cams, although I can’t imagine how they track without wide-set binocular cameras) that doesn’t require wearing a device would be optimal.