There are definitely flaws in their plans, Manchester United's defense is a little weak but those of us who understand football fairly well must say their midfield and attacking line-up is very strong yet they cannot do well with this team.
It is quite likely for us to see Manchester United defense getting better. Have you heard of the most recent transfers? They have signed Mazraoui and de Ligt. They are aiming to sign a defensive midfielder also.
These are good steps to take to fix defensive problems at a big rate. Europa League winner odds aren't determined yet. But I expect Manchester United to be one of the biggest favourites of course.

It isn't unrealistic I think. It is all up to having a working system after making the right transfers. I hope ten Hag won't fail about that this time.
Yes indeed, Manchester United managed to bring in Matthijs de Ligt and Noussair Mazraoui and both also from Bayern Munich and also, in their first match in the Premier League yesterday also the two players were played and Manchester United also managed to win there. In addition, that Manchester United also still has Leny Yoro who is also a defender but unfortunately, Leny Yoro suffered an injury he suffered during the pre-season match.
With these players, then of course I also believe that Manchester United's defense will be better in this season. Thus also, Manchester United have players who have good quality for the main players and reserve players. So yes, it is hoped that Manchester United can maintain a good performance also with such players, will make the rotation of players carried out will also be able to provide good results for the team.