Galatasaray and Copenhagen both want to win because they both have the same chance of qualifying from the group phase, while Manchester United must win against Bayern and have to wait for the results of the matches from Galatasaray and Copenhagen.
So I think everything is possible here and Manchester United still has a chance to qualify even though the percentage is quite small.
Being a team whose fate is determined by the results of the matches of other teams is certainly an unpleasant thing and that is what Manchester United will experience. Winning against Bayern Munich even though this looks impossible will be in vain if Copenhagen or Galasataray win in the sixth match, even if their chance to being able to get a third place is also quite difficult so this may be a quiet bad season for Erik Ten Haag at Manchester United and seeing United make a coaching change at the end of the season is very wide open because the owner is dissatisfied with what is happening at his club.
From Copenhagen and Galatasaray, the team that will qualify, Galatasaray's chances are quite big even though their last match will be at home to Copenhagen
I agree that depending on the fate of other clubs is something that is very disappointing, and that will be experienced by Manchester United at this time. Manchester United can be said to only depend on luck now seeing such a reality. Because if they win against Bayern Munich, then if Galatasaray or Copenhagen one of them can win then it will not make them qualify, only maybe they will be in the Europa League play offs. But still it is something difficult, even their opponent this time is Bayern Munich which we know what their strength is like.
Man United qualification to the round of 16 is 50-50 because if peradventure, they could be able to win Bayern Munich which I am not confident on that, they still need to depend on the result of Copenhagen and Galaxataray match to know their fate. They have put themselves in a very tight corner and this is very bad.
It is better than United should start preparing for Europa because that is where fits them since they are not that serious with their UCL matches, maybe they will do better there.