I don't think that's the problem. Theoretically, a visual or auditory cue that tells you a gesture has been executed is identical to the tactile feedback of a button click. Where gestures often fail is spatial precision (where the mouse excels) and sequences of actions (where the keyboard excels). If the software interpreting the gestures is precise and has a low latency, it could conceivably be as good as a mouse. It's unlikely that gestures could do anything better than a keyboard, but that's probably more due to user experience than anything else. If you could teach it sign language, it might even be better at text input! Of course, that requires the user to also know sign language...
I can see it be useful for basic interactions such as closing or minimizing windows, switching tabs, showing the desktop, clicking 'OK', 'Cancel', 'Next', 'I Agree', or any other action that is never context-sensitive but always requires the mouse to be in a specific position.



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