Has anyone ever thought of strapping a level to their leg to see if they hit parallel?
Strap it in tight from knee to hip, take it for a ride to make sure it stays, and thats all the judgement anyone would ever need to judge a squat. Perhaps using a string level and two loops that are sewn into the suit at the desired points?
I think this is a real option and it would stop all the internet judges dead in their tracks. As long as that bubble hits the middle, its gotta be good.