Yea, I agree with this for gaming. Eye tracking as a gaming interface probably requires rethinking a lot about games. In VR for example the movespeed is much slower. In normal video games the character movement is constantly super-human speed, and this is jarring while in VR.

I am speaking mostly about the desktop interactions. In your Chrome Dev situation, I would look at the cursor before clicking on the stop recording button. I think I might be able to trust the MBP trackpad to do a primed click without looking at the cursor, but I wouldn't trust a traditional desktop mouse to have stayed steady enough.