Dude I think that’s just his face

I mean to answer your question I’d have goal line technology for every touchline. Takes one less job away from the assistant referee let’s them focus on the rest of the game.

But you can’t take away subjectivity otherwise every foul is a card. Refs need to be able to make judgement calls about intent etc no rule book can cover every eventually.

Maybe in the future advanced AI learning could compare a foul to 100s of others in a database and suggest a punishment to improve consistence but as long as refs are human and the game is played by humans it’ll be subjective.