They can solve all or 99.9% of questionable goal line AND offside goals if they used instant replay. Check all the goals that are contestable. It isn't like there are that many goals in a game any way and even less that are debatable.
Should have been in 10 years ago anyway.
Im with you its not like they have 30 shots a game they with have to review. Its usualy one maybe two. But that one or two could mean the difference in who goes home or the path of the game.