Barcelona having a great offensive line wouldn't be enough if they didn't had a great defensive line as well. Hansi Flick made some massive improvements on defense, he realized that the defensive line itself isn't good enough, and if they just parked the bus they would lose, so even in games where a tie is enough, they still play counter attacking at worst case, because they just prefer to make that a unison work that would allow them a chance.
Of course having great attacking line wouldn’t have been enough but having a good defense that matches the performance and balance things up is really what have made them to be at their best this season. I would say kudos to Hansi Flick for how he has transformed Barcelona, no one ever thought with all the financial crisis at the club he was still able to make them a title contender not just contender but the favorites to win the title.
Their current football pattern is really not bad and it is effective but i don’t think this style of play will last long, i won’t be surprised if I see them drop in performance next season.