I see lots of people walking and scrolling on their phone. Every once and a while they look up and continue. What will happen when you control it with your eyes and you look up, will it scroll?
Still, on my 13 Pro it doesn't seem to be following my eyes correctly half way thru the screen - I need to actually look a little bit up away from center of field to get pointer to select anything. I tried setting it up few times and same thing happens over and over. Scrolling seems to be done via the widget - similar to the Assistive Touch one. Unless there's some "eye gesture" I haven't figured out yet.
It's really interesting feature, surely helpful for people with mobility issues but for majority is rather a novelty you can show your friends. The feature I do use quite often is voice control which can be activated without training and it helps when you have busy or dirty hands and you don't want to touch the device