Co-owner Sir Jim Ratcliffe chose to cast another eye over Erik ten Hag's struggling side rather than travel to Wembley to watch United win the Women's FA Cup for the first time.
It is hard to work out what Ratcliffe would have learned from watching another home defeat - other than it simply re-affirming the size of the job he has on his hands lifting this fallen football giant.
United's squad, hardly fit for purpose when all players are available, was stripped of key assets such as captain Bruno Fernandes, who watched from the directors' box with a pained expression.
Ten Hag, his smart suit soaked by a torrential downpour amid a thunderstorm that hit Old Trafford late on, will point to his lack of resources - and rightly so on this occasion.
But the fact United were unable to cause Arsenal keeper Raya any serious problems was a sobering lesson in the current state of the Red Devils.
Kobbie Mainoo tried to galvanise the hosts' midfield while Alejandro Garnacho ran tirelessly out wide, but it was a tough afternoon for young striker Rasmus Hojlund, who got very little change out of Arsenal defensive duo William Saliba and Gabriel.
United are a club that needs a reboot and re-invigoration and - while this was not the day to make judgements on Ten Hag - it is becoming increasingly difficult to see how the Dutchman can be part of the new era and structure under Ratcliffe.
Paul Merson
