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> I think this is a wonderful idea, given that touchscreen responsiveness and power optimization have been a focus of research over the last decade.

Are you familiar with the state of the art? Is this thing going to be as responsive as a regular touchpad?

IIRC touchpads and capacitive touchscreens use the exact same technology, so there shouldn't be any difference.

Yes, but touchpads aren't constrained by the necessity of having an integrated high tech light source and a transparent layer on top of it.

Do phone screen noticeably lag these days? I don’t see why there would be a difference.