But that's an issue. Goals are clearly defined, pens are not. Ref in front of TV will be put under pressure by managers and would make controversial decisions. And sometimes the main ref has better view than the camera, who should override who's decision? And in this case, how do you restart the game after that? With a drop ball inside the penalty box?! It's very impractical and will never remove the human errors from the game unless you have the game played by robots. What about Croatia's goal? You can have two refs debate about that for half and hour and not agree. Do you stop the game while the refs debate? Who gets the last say?