In the last two seasons, Barcelona have failed in the Champions League and also failed in the Europa League. Thus, even though Barcelona won the La Liga title last season but still, Barcelona does not have the quality that can take it to the Champions League final. So basically, Xavi only improved Barcelona's performance only for La Liga but as we already know, that Xavi still does not have the ability to be able to make Barcelona have the same good performance in all competitions. At least, I'm also not sure about Barcelona next season to be able to get good results in the Champions League, because it looks like Xavi will only continue to prioritize to match in La Liga.
However, despite the failures in the UCL and UEL, the improvement in Barcelona's squad performance in La Liga and becoming champions is an extraordinary achievement. We know that the current Barcelona players are not the same as those from a few seasons ago when Xavi and Messi played together. Xavi can do a focus to make the team more strength. If Xavi can remain consistent with his strategies, the performance in the UEFA Champions League will also improve.
At least with the arrival of Xavi as Barcelona coach there have been great achievements in LaLiga, remember that winning all trophies in all competitions is difficult not easy to do it even though Xavi has improved in terms of his team's performance.
The Barcelona Era is over now we have to be content with watching them when they were together now Messi plays in the MLS league and Xavi is the coach of Barcelona while Iniesta I do not know where the club is now, the main thing when their era Barcelona was at the peak of his career with a flashy title.
Now it can only see new players but we have to enjoy their game.