I'd go with uncomfortableness every time. I'm pretty sure it's a word I've used before, so if we both have, it must be a real word.
I agree that if people use finger drumming, then velocity may be a bit hit and miss anyway. I'm sure if I used the pads on my A-300 Pro I wouldn't get that great a result either. I use my V drums, normally (and sometimes not normally, too).
The iPad certainly doesn't seem to work well (velocity wise), for me, but I've not used it a lot. I also don't know if a large, fixed touch screen could use the same approach (accelerometer), but I guess we don't know what's around the corner. Perhaps we'll be air drumming..
I use the iPad to remotely control Sonar, if I'm recording away from my DAW, somewhere else in the studio, using AC-7 Core HD. It is pretty handy, but between you and me, I used to just take my wireless keyboard and use keyboard shortcuts.
I just like moving the touch faders - I feel like Mr Sulu..
edited for spelling