I would not go to Manchester United if I was Osimhen. That can put a lot of unnecessary pressure on him. Manchester United need a striker that is not only a good goal scorer but also technical. A striker that can drop deep to the midfield when the game is hard and support his teammates. Osimhen is kind of like a traditional top striker, just like Halland. Those kind of players require special kind of management before they could perform well at top level. Ten Hag does not play with those kind of strikers, he loves everybody to be involved in the build up of the game. Manchester United should go all out for Harry Kane.
But Manchester United do have a lot midfielders who can support the striker, just take a look with Bruno Fernandez, Casemiro and Cristian Eriksen, their assists are high. I tend to agree if Osimhen is also a pure traditional top striker like Haaland, but I don't think it's wrong to join Manchester United. Weghorst will leave the club in the next 3 months, Manchester United doesn't have any pure striker.
When a coach wants a player, he means he has seen that the player fits what he thinks his strategy is. After all, I agree that Manchester United now has a midfielder who can pamper a striker with the bait they provide, maybe now there is still a sense of selfishness that I see from Manchester United players. But if the coach can get rid of that they can become a good supplier of the ball, and I see Erik Ten Hag being able to do that.