[windsurfer]

I personally wouldn't scrap an entire design when < 1% of the population can't use it.

Intuition isn't important. The designer mentioned that this is a trade off, and is intended for regular users who have muscle memory of their controls. You can always add a tutorial or "help" mode by pressing a button in the bottom right or whatever, anyways.

[matthaeus]

The beauty about touch screens as input mechanisms is that they can obviously show an infinite number of interfaces. I absolutely agree that there's a right time for the right interface. My proposal is just one possible way to use a touch screen for input.

[scott_karana]

It's not just people missing fingers. Anyone wearing gloves, or with dirty hands, will have issues operating a multitouch screen, in a different way than people with phones might.