Agreed.
It doesn't make a difference if he's on the left or right, he just isn't a very good fullback for any team that wants to play a more dominant brand of football in possession. It was easy to see that he just didn't have the ability in possession when we signed him. But for some strange reason, Solskjaer and Phelan made the decision to sign both Maguire and Wan Bissaka, which would ultimately prove costly for Solskjaer as far as developing a system of play is concerned. And he hence had to adapt to the weaknesses of his signings, which gave rise to the Fred/McTominay partnership in midfield with Lindelof and Maguire at CB and De Gea in goal. That is a very poor way of developing a team imo.
And with both regular left backs injured, someone has to fill in for now and neither Lindelof or AWB are good enough in such a role. But you would expect AWB to at least position himself properly against a championship team. He could quite easily make the same mistakes playing as the RB.