It could also be huge for ergonomics. Many people develop RSI issues through repeated keyboard and mouse usage. People have as gone as far as using their nose as an input device:
An unintended result of the advent of reliable/portable touch devices was the reduction in physical hardware input.
Instead of clamping down a joystick to a desk and moving it around with your face... or looking away from content to type on a keyboard with your nose... you can buy an off-the-shelf product and use it on just about any solid surface. The iPad was huge for people with limited limb control.
It'll shift to RSI doing these gestures instead. They're still fine motor control which is what's involved in RSI. Notice how runners don't get RSI in their legs but pianists do.
Background: I have RSI and have battled it for 15 years now. There's a lot that's mental and nervous system, and can easily shift in the body (almost gave myself RSI in my throat and eyes doing voice rec and eye tracking to avoid typing).
Anything fine motor, even if the motions are changed, will inevitably cause problems. The duration doesn't have to be that long -- I could feel the fatigue in my eyes with eye tracking after just 30-40 minutes. The irony of course is that my eyes are doing fine motor control all the time, but when you do it as part of a control-loop then _something_ (neuromuscular?) will cause you to go into RSI mode and you fatigue quickly. If you don't pause for the fatigue you can do permanent damage -- which is what happened to my hands on the most non-ergonomic Apple Newton keyboard.
I use fine motor control for pleasure, not just work.
http://www.looknohands.me
There are lots of other RSI stories here: https://github.com/melling/ErgonomicNotes/blob/master/README...