Well, a lot of Manchester United fans don't agree with you. Somehow fans believe winning the FA Cup erases all his wrongs. I understand that they want to give the manager more time. That's understandable, but you only give a manager time when he's showing signs of improvement, not signs of deteriorating. He finished 3 in his first season and finished 8th the next season. That's not an improvement.
Look at the way Manchester United play, since he took over, they've not been impressive, they were worse this season. Arsenal and Liverpool gave their managers time and it paid off, but we should also remember that Arsenal and Liverpool showed signs of improvement over the years that's why they were given time.
Everything is wrong about Manchester united, the players performance and the managerial skills. If winning FA cup erase all things he has done, does that help the individual stats? What are the criteria to vote Manchester united players for individuals award? On what ground do you think they need to give any of their players a Balon D'or because I'm not sure if any of their players will be among top 20, look at Chelsea Performa finishing in 6th place, Cole Palmer will definitely be among top 10 contestants, this is what Manchester united doesn't have with all of their players including the expensive ones the bought this season.
The players are not improving, and neither are they motivated. The way he handles his players and makes excuses is not the way to go.
It's obvious from the way the team plays that the number 1 problem is the coach.
Aside from Ten Hag, the Manchester United board need to make big decisions on players they hire and players they sell. A lot of players need to leave, and a lot of other positions should be filled by quality players.
The coach is the problem, you can't blame the players all the time, the players don't have the final says if the coach tell them to play a particular style, doing what he doesn't approve will get them bench for the next game as punishment or not allow to be present just the way he was trying to discipline Rashford and some other players that doesn't listen to him. I believe at this junction, Ten Hag must go so the club can focus on another manager to bring a new style to help the team and the club.