[wtallis]

I think the lack of haptic feedback is what doomed the Touch Bar. If they'd been able to solve that problem, it could have been an acceptable replacement for the function keys.

[shawn_w]

I wonder if a keyboard where the keycaps are little eInk displays is feasible.

[throw-the-towel]

Already tried twenty years ago, although with LCD not eInk: https://en.wikipedia.org/wiki/Optimus_Maximus_keyboard. The keyboard was too expensive to be mass-produced at the time, though.