From reading/listening to reports of people who were able to demo the device, I think Apple may have nailed it, or come close. Everyone I've seen has absolutely raved about how accurate and intuitive the eye tracking + hand gesture feels.
I think unless Apple has really added some sort of magic, it will be an issue for most people to use Vision Pro for anything but passive activities, or with a physical trackpad.
Compare with a smartphone, I can move to tap the 'back' button in Safari without moving my eyes to the back button. Looking "at" the phone generally is enough to see where my finger is, and say clicking on links I can look at the link and move my hand to it and move my eyes away while my hand is moving.
Having to coordinate looking and clicking - while I haven't tried it - I can imagine that feels more load-bearing, more effortful, more constraining, more annoying.