Barcelona have so many talented players, the problem is just the coach. It's very rare a good player can become a good coach, same like Xavi Hernandez. What make Barcelona strong is because of high individual skills, the team play and strategy aren't different from one to another match.
Although Barcelona able to win the last season La Liga, it's an achievement, but they're still not developing.
I even saw that in Xavi era Barcelona had shown better progress than the previous coach. I think if we look at the current developments for sure Barcelona is on a better path because Xavi has started to show better development of the strength of the team or the depth of their squad.
I think for now Barcelona have shown their strength in Laliga and I'm sure next season Barcelona will focus all their strength on the Champions League. Apart from that, I think there are things that are interesting for the depth of the Barcelona squad because next season Gundogan will be one of the additional factors for their midfield which will make Barcelona very reckoned with in the Champions League.