"Press this, no, hmm try harder, no not that hard, no the other one you need to press lightly, wait maybe that's too light..."
Some things obviously lend themselves well to this. The piano example is good, as is drawing. However, things with a threshold sound less obvious.
> “There was a physical thing on the screen,” he says. “You had to select the button and move it over.” It was better than the existing ideas, sure, but what was that button? It moved too freely, you didn’t know how it would move or how to make it stop.
You didn't know how it would move or how to make it stop? Really?