There's a big challenge in usability with keyboard-only. I don't at all dispute that keyboard is faster, once you learn how to use it with whatever application(

There's a big challenge in usability with keyboard-only. I don't at all dispute that keyboard is faster, once you learn how to use it with whatever application(s), but that's exactly the problem. I heavily use the keyboard, and for certain things (mostly apps I use daily) I'm highly proficient with it, barely touching the mouse at all. But once in a while I have to work with a spreadsheet, or edit an icon, or use some other piece of software I only use maybe a couple times per year. I simply don't remember shortcuts and I certainly can't justify spending the time to (re)learn enough to be more efficient keyboard-only that with a mouse, so I just rely on the mouse. It's hard to imagine any keyboard-only (G)UI doing a better job at making usage discoverable than what can be done with a mouse-enabled one.