Maybe someone can help me out here, I am not sure what exactly John McEnroe, Mr. "You've Got To Be Kidding Me," said about calling shots out, now that it is 2022 and many years after he yelled at the Referees, but I think he suggested on Sunday they should set up a rule at Wimbledon, as apparently other tournaments, like US, French and even Australia Opens, have done, to not let the standing referees at either end of the court question the "let" calls or calls not made, in fact to eliminate the standing referees altogether and just play on to the next point when the Hawkeye machine calls a ball "let," it is out; and/or also to not try to make calls on their own--to let Hawkeye do it.
Is that what John meant? And I think his thought was intended to keep the matches speeding right along without stopping and to keep the television fans interested, to not bore them with call arguments. Also I add it might help some arguing players stay calm and concentrate on their tennis and not the anger that can go with some of the calls.