VAR is doomed and always has been because too many decisions are subjective. It was said before it's introduction but was drowned out by the wailing of alll and sundry demanding a perfection that cannot be attained. The game is so much worse off for it's introduction but I fear the genie is out of the bottle and will never go back.
How is it possible to prove that? Technology as it is with its lines is measurable, a distance figure of possible infringement is attained. “He looks level to me” Linesman, spectator or tv analyst is just an opinion based on varying eyesight with no figure of measurement. Therefore impossible to prove.
Seems to me that var ignores one vital part of the offside rule. The "when the ball is played" part. If your going to give offsides for fractions then you have to know the precise moment when the ball leaves contact with the passing players foot. And that's impossible to tell using current technology. So again it's back to guesswork. #Ad@m posted (above) just as I was writing my comment but it goes along with what I'm saying so I'm leaving it in!