+Brian Choi You get the wow factor for couple hours and then it gets tiring
I think one of the problems with extended use as the main input would be getting some Gorilla arm syndrome:
> "failure to understand the ergonomics of vertically mounted touchscreens for prolonged use. By this proposition the human arm held in an unsupported horizontal position rapidly becomes fatigued and painful". Vertical touchscreen pain
> Indeed, Apple's Steve Jobs – not usually one to dismiss a pretty gadget on the grounds of uselessness – once said he'd never launch a touchscreen laptop because of what he called "gorilla arm".
> "We've done tons of user testing on this," he said back in 2010, "and it turns out it doesn't work. Touch surfaces don't want to be vertical. It gives great demo, but after a short period of time you start to fatigue, and after an extended period of time, your arm wants to fall off."
> It is possible, of course, to position a laptop so that the screen is reachable without lifting the elbows from the desk; but this means bringing it much closer than most people find comfortable visually.
> Microsoft's online advice on using a PC safely doesn't mention touchscreens at all – and, ironically, instructs users to avoid just those movements that a touchscreen notebook demands.
> “Although we reached out to Microsoft for this story, the company did not respond to our request to comment.
> In order to touch the display on a notebook with that capability, users either have to fully extend their arm (bad and uncomfortable), lean forward (bad and awkward) or move the display closer (bad for your vision).”
It’s not as bad as a touch UI in a desktop environment, where you actually have to reach out, and touch the screen, but it could still be a problem.