I was expecting Arsenal to win but I thought it might be a different kind of match. The goal came early. Altay Bayındır made a huge mistake. Amorim said about Onana that he's not injured, he just wanted to give chances to those who prepared better in pre-season. In my opinion he can't continue the season with Altay. On Arsenal's side we saw the saves Raya made. Every good team needs a good goalkeeper. Arsenal started well, hopefully they continue the same way.
Just like you, I also banked on Arsenal to win the game but I was unsatisfied with the performance of Mikel Arteta's men even when I know they left Old Trafford with all three points. I watched both halves of the game and if I must be honest, Manchester United were the better team in both halves but were unlucky to concede that first half goal due to Altay Bayındır's mistake.
Manchester United manager Ruben Amorim I think has a lot of positives to take from the game because for the first time in many seasons, I saw Manchester United playing entertaining and exciting football against a top team like Arsenal. Benjamin Sesko needs learn how to bully defenders and make them uncomfortable, that's what I think is lacking in the Manchester United I saw today — a striker that's very physical but still lethal and sharp in converting chances.