Lol it is very unfortunate when a club as big as Manchester United has to obey a manager like Erik Ten Hag, let alone trusting his slow process, even though with almost 3 seasons, Erik Ten Hag should have been able to provide better improvements but as far as I can see Man United's performance is still the same and tends to decrease, the amount of money to recruit players also does not help the club at all. If the club is willing to accept all the risks, they must also be prepared if they end up finishing in the middle of the table on par with average clubs, even now Man United does not look like a top club because its quality is decreasing.
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Handing over the club to a new manager means placing more trust in the new manager than the previous manager and expecting the team to perform well under the new manager.  Manchester United expected that and relied on Ten Hag but far from improving the team's performance this manager has consistently deteriorated under him. 

In the case of other clubs, if a new manager is appointed, if that manager does not perform well, then the manager is removed from the responsibility of the next season, but Manchester United did not do that, they only trusted this manager. Under this manager the team performed poorly for the entire season but they trusted this manager for one more season which resulted in this manager consistently making the team a bad team. 

Since Manchester United has extended the contract with this manager for one more season, this manager may be seen in Manchester United for one more season, but the manager of Manchester United may change in the next season.