You are right about getting a new coach not changing everything easily and also we can’t expect the new coach should come and the team performance will change immediately
Sometimes a new coach can bring some immediate effects but such effects don't last long. They are like effects from a honey moon and end when honey moon is over. We now there is no honey moon can last forever so to change a team quality, it needs more than instant and short term effects.
The reason why I don’t support Erik Ten Hag as a coach of Manchester United next season is that he has made Manchester United become another team that we haven’t seen before
Manchester United performances are not too good in this season, you can say terrible too, but it's not right to say all responsibility belongs to Ten Hag. There are other people in the club have to be responsible for this bad season, players, staffs like medical team, sport director, scout team and can not exclude the club owner.
did we know that if Christiano Ronaldo and some players that he has a misunderstanding with and go on a loan didn’t go anywhere Manchester United will be a very strong squad in the premier league next season, Erik ten hag has spent two seasons now and the team performance remains poor, and I believe if he is still in the team Manchester United will still lose another player very soon.
Two seasons, the first one looks good but it is a bad point with his relationship with Cristiano Ronaldo. If all things leaked by Cristiano are true, Ten Hag actually is bad in his ways in handling conflicts with players and possibly it is one of biggest reasons for the club's bad performances in this season.
As Ten Hag is still a head coach, players will not raise their voice publicly but if Ten Hag is sacked or leave the club this summer, or next some years, we will know some hidden facts about Ten Hag's works in Old Trafford.