We still don't know how Rasmus Hojlund will perform. If he performs well, it is good for Manchester United. But Manchester United definitely needs an experienced striker.
Marcus Rashford is Manchester United's most experienced striker. And while Rashford is an excellent player, he is only 25 years old. He played very well in the last season. Rashford scored 17 three goals. However, if Manchester United's goal is the title, and if they want to maintain continuity in the Champions League, then they must add experienced players to the team. Otherwise, the team will not be able to survive in the competition.
Actually, Rasmus Højlund hasn't impressive performance last season with Atalanta by scoring 9 goals from 32 matches in domestic league, its not really promising striker exactly with Primer League who know most hardest competition than Serie A. I doubt for first season he will adapt well with Manchester United and possibility scoring many goals. Probably Rasmus Højlund still young striker 20 years old, I don't sure how potential is he with Manchester United next season actually he has two weeks left for adapting before Manchester United first match Wolves two weeks later.
Marcus Rashford is most experienced striker for Manchester United right now, but Erik ten Hag put him as winger than central striker and United really need with experienced striker for next season. Expectation signing Harry Kane but the reality Manchester United fans have to accept with Rasmus Højlund.