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I don’t think I’ve try to click something without looking exactly where the pointer tip goes ever

My guess is it'll be a personal thing where for a percentage of people it'll be fine for daily use, for another percentage it'll be tiring, and then for a final smaller percentage it'll be truly awful and cause migraines or whatever. Also I have yet to see much talk about how this will work for people with abnormal/poor vision (e.g. abnormal pupils or sclera, vision only in one eye, etc.). Although I do think Apple has a good track record for accessibility?

There's no way know until many thousands of people are using this device how those percentages will pan out.

From the early reports, there is nobody saying they have to focus in some special way - you just look at the control, and tap.