By all accounts, the Vision Pro eye tracking is extremely good, so for pointing inputs it would probably beat hardware controllers on speed and precision metrics, as well as feeling more direct and natural.
I was thinking if eye tracking can cause more eye strain over long time, cause you'd have to focus your eyes more on something, than say casually moving pointer with a mouse or controller.
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.