Technically Barcelona don't include an attacking midfielder in their usual formation. There is no such player in their squad as well. Bernardo Silva is mainly an attacking midfielder so Barcelona really don't need him specifically now. Of course he can play as a right winger as well. But there are so many alternatives on both wings at the same time.
While they have Raphinha and Dembele in the first place they don't need another big right winger transfer. This will just have to keep one of those players outside of the starting lineup if they bring Bernardo Silva to the team. I don't think Xavi wants that now.
I disagree because I still think Barcelona need a Charisma like Bernando Silva in that squad. It is not like Barcelona do use an attacking midfielder but the problem was the attacking midfielders were so talented that played both the central midfield role and also the attacking role, this players were both Xavi and Iniesta. And since their departure the club is yet to find a better suited replacement for any of them. The likes Authur Melo, Pjanic and Cutinho couldn’t feel the role. Then they have the likes of De Jong, Pedri and Gavi. This three would have been enough but with Busquet not longer in the team both De Jong and Gavi will be limited to play more of a defensive role than an offensive one. Also Gundogan was a good acquisition but his age will certainly prevent him from having lots of minutes.
Now comes to Silva who can perfectly play both the attacking and central midfield role and also be able to fit in on the right hand side. Why i would like Barcelona to sign him is; just like last season Pedri and Dembele could be out injured and leaving the two roles short of numbers, but with Bernando Silva you have a player than can fit in perfectly on both.