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.
If the manager makes preparations about what tactics will be used next season, then the manager should also play his main players, and not young players or second-line players who are played in pre-season matches like this. Therefore, I personally feel that they are not making preparations about the strategy or tactics that will be used next season, but about considering the abilities of the young players in the squad.
So yes, this meant that the results were not optimal even though they only played against mediocre teams but Manchester United still failed to win. But indeed, I also don't take the results in pre-season matches like this seriously, because I also avoid betting on matches like this. But indeed, because they also need to rest and go on holiday, I don't think the manager can force them to keep playing with their best efforts, because it seems like that would also have a bad impact if done in a match like this.