[alan_cx]

Your comment reminds me of something pointed out during a boxing match many moons ago. Which was essentially a comment about how hard it actually is to simply hold up one's arms and fists over quite small periods of time, let alone constantly move them around, then start punching. Its actually quite draining.

Current input schemes involve a lot of support of the hands and arms. This waving hands around in the air offers no physical support.

So, I think that its use will be limited to a subset of tasks, where it will be revolutionary, but much harder to integrate in to general use. Simply because of fatigue.

[RogerL]

Yes. Millions of years of evolution led us to manual dexterity with our fingers, and with it we have (in an intellectual sense at least) taken over the planet.

I have grave doubts about devices that ask us to give all of that up. The medical apps talked about above seem like a pretty good use, if you need infrequent medium-to-gross motor control of something in a sterile environment.