We are not getting the expected performance from Barcelona because of some weaknesses in defense and midfield. They dropped points against Bayern and Inter in the Champions League due to defensive weaknesses and mistakes. Xavi is more focused on his attack and he has strengthened his attack. But Barcelona's defense is still weak. If the defense is not strong, Barcelona will not be champions of La Liga. Barcelona management will probably focus on strengthening their defense in the winter transfer window.
If we look and compare some matches especially in the champions league overall their game is really bad, even though they have ball possession control. however, their form of play was a complete mess. the defense and the midfielders didn't contribute much, their two wingers were completely ineffective. the results are far from what we expected.
In the match against Villarreal, Xavi really rotated some of his players. especially for De Jong who replaced Busquets, he was able to play loose and play really well.
As a result, Barcelona won the match by a landslide. but this new strategy has not promised anything, in the future we will see how effective Xavi's rotation is in the next match.