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I'm a bit out of my territory here but I'll throw out a comment. I use a Wacom tablet and pen for digital editing in Photoshop and Painter. The Wacom 'system' requires both a pen (sender) and a tablet (receiver) of some sort. Touch screens may be able to read the pen as a sender as well (no experience with those). But it also requires drivers to interface between the pen and the receiving device. Wacom builds those drivers for its various tablets, but I would expect that non-Wacom manufacturers would have to provide their own, and if the Wacom pen is not a common input device, they would have little incentive to do so.
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