They really are, but I always hate it when people put all the success on Flick, when they had Xavi, they managed to win the league title on his first full season, which shows that Barcelona is already a great team. Plus, Flick is using plenty of young players that Xavi unearthed by making them play and promoting them from La Masia, so he did had a big hand in this being a big deal.
Doesn't mean Flick didn't do anything, of course he was a big part of the reason why they got better, but Xavi had a big part in it too, it was a combined effort if you asked me. Also the players Barcelona have are usually great, if only they didn't spend 100+ million on a few players back in the day, and just promoted players from young team.
Yes, if for example all the success achieved by Barcelona so far, and the only one who gets praise is Hansi Flick, I don't think that would be a problem. Because basically the one who is currently handling Barcelona is Hansi Flick, so it's only natural that all praise is directed at Hansi Flick. However, I also agree with you, that Xavi also played a role in the success achieved by Barcelona today. Because it cannot be denied that the majority of players currently in Barcelona were present when Xavi became the coach at Barcelona. But unfortunately Xavi was unable to make Barcelona continue to show good performance with the players he brought in. And I think that was the obstacle for Xavi when he became the coach at Barcelona.
However, currently Hansi Flick is able to make Barcelona a very strong team again with the players brought in during the Xavi era. So it can be said that Flick has a good approach to his players at Barcelona. So he knows what strategy is suitable for the Barcelona players. That is why Barcelona currently has a very good performance and can be said to be better than Real Madrid. Because in the last few meetings Real Madrid really did not move when playing against Barcelona. So with that, I think it is only natural that Hansi Flick is currently getting a lot of praise from Barcelona supporters.