It seems that both Manchester United and Tottenham are competing among themselves to see which club will become the most worst English club in history. Even with the club owners of Manchester United and Tottenham providing huge amount of money for the club managers to use in the transfer market, I guess it still does not change the fact that both of these big English clubs are still playing much worse than smaller clubs in the English Premier League this season.
Currently, Manchester United may be in a slightly better situation, but if they did not change the manager quickly, the situation of Manchester United would have been worse. The manager who previously managed Manchester United may have thought that while other teams were struggling to get to the top of the points table, he may have thought about how to go down the points table. If he did not do that, how could he not change the condition of the team even after serving Manchester United for so long.
There is no point in blaming him completely, some blame must be given to the management. Where the management could see that Manchester United were not doing well under Ten Hag, why did they extend the manager's contract year after year?
If he had been sacked after a season and put in charge of another manager, Manchester United might have found themselves in the top five of the points table.