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This lappy I'm using right now has a touch screen.
I never touch it, because:
0. It's further away than the keyboard and mouse. Why stretch?
1. Touch is less accurate, and requires more hand movement that using a mouse (I have to move the mouse 1" to move the cursor all the way across the screen; I would have to move my hand all the way across the screen).
2. I shout at people who make greasy finger-marks on my screen, and I don't want me to shout at me, because I'm too scary.
Touch screens are great for phones and tablets, but the only people who want touch-screen computers appear to be microsoft "innovators" -- even most graphic artists don't want them; it's too easy to mess up your work, with a touch screen, and it's too much hand movement.
I wanna be a eunuchs developer! Pass me a bread knife!
I use the touch screen on my laptop for some purposes. Mostly I use just keyboard-n-mouse -- as others have noted, fingers are not very accurate. [I don't care for touchpads, either, as they're slower to use than a mouse]
However, in doing demos for 1 or 2 people, the touch screen makes things easier for everyone. No need to transfer the mouse, just drag things around on screen. There are also times when I'm reviewing long data lists where I need to make short jumps -- the touch screen works well.