Hopefully Man United won't play that bad when the season starts. And actually in the pre-season match against Rosenborg we saw that Man United did not play with their best squad completely because in that match Man United also gave the young players the opportunity to play. So I really understand these results. But if ten Hag is able to make a good strategy then even with young players he should be able to show a better game than that.
Ha! Nothing is changing at Old Trafford as long as they still employ Erik Ten Hag.
Also, I don't know why you all are taking pre-season results too seriously. It is common for games like this to end in draws or defeats, since they are not playing a full-strength XI. Rather, the objective is for the manager to figure out what tactics will work and not work at the beginning of the season, and which players he should use for that.
Losing to a team that is not well known at all is of course very embarrassing for a big team like Manchester United at the moment, even though the match was only a pre-season match, but Manchester United should not have lost although fielding young players and most of the second tier players, previously Manchester is actually the favorite able to win over Rosenborg but in fact their lost from a team level is far below Manchester United So far, the pre-season match has been used as a match to test the strategy and mentality of young players, but the defeat against Rosenborg clearly shows that Ten Hag strategy is not very good, although the defeat against We can't use Rosenborg as a reference if Manchester United is still in a bad condition at the moment, but I think it's better for us to judge Manchester when they play an official match against Manchester City at the Community Shield later.