I have not watched Rashford perform yet on Barcelona but I have an optimistic mindset of his positive change in the club because he is going to do what he has never done before in Manchester United, people are really thinking otherwise about him but what they did not no is that Manchester United is usually not a club to say that a player will never do better if they leave the team to another club. What Manchester United could not do for him Barcelona will do it better for Rashford because he will be starting from the champions League and even if they did not win it there is certainty of another new season champions League.
Rashford will certainly have a lot to prove at Barcelona, but I have always seen this player as someone who can give a lot to this team, even when he played at Manchester United he was never fully understood in my opinion, It's an excellent purchase and will give you a lot of satisfaction.
This won't be easy for Rashford, as Barcelona has several contenders for the forward line. There are still plenty of opportunities for Rashford, but it's better for his career development than staying at Barcelona.
And for Barcelona, I think Rashford's arrival is also very beneficial. Last season's problems were in the forward line, and perhaps with Rashford's presence, that could be resolved.