Football's not a game where you can stop the clock whenever the ball isn't in play. Clive Thomas, in his autobiography writes that he did this once when he started refereeing, and the game lasted more than four hours. American football does this, and their games are often over four hours from start to finish.
I remember a few years ago, the authorities declared that as football was an entertainment business, they should encourage more goals, and law amendments, for offside etc., took this into consideration.
Then VAR came in, and all that was done away with.
Extra time is a complete joke though. It favours time-wasting teams and anti-football. Courtois taking the ball to the opposite side for every goal kick? This law amendment was introduced to get the ball in play quicker from a goal kick, so don't let teams misuse the law. Players feigning injury. Ok, the first one might be genuine, but when the same player repeats the obvious trick two minutes later, don't stop play for him. Make him walk off the pitch for treatment. When 30 seconds is the recommended time to add back on following a substitution or a goal, actually apply that recommendation.
But we have reached the point where we do need some sort of verification on time lost during the match. Who decided on three minutes last night, and how was that selected? It's just so arbitrary, and it flies in the face of fair play and encouraging entertaining football.