I think also Hansi Flick is a coach who is equally new to Barcelona, so this argument will not be strong if you look from that side like Kompany, but if you look at H2H wins Barcelona is in a bad experience when meeting with Bayern Munich, now we see that these two teams are in pretty good condition in their domestic league which will make it quite difficult for us to determine who will win, my analysis is quite lucky about this match, but if you talk about feeling and just rely on instinct alone I think Barcelona has the possibility to get a victory.
Regardless of who the coach is, the past history is almost the same where Bayern always looks superior and becomes a nightmare for Barcelona because if you look at the h2h matches of the Setien, Koeman and even Xavi eras, Barcelona was unable to face Bayern's dominance so it is very natural that the match will be like that.
What is different now is Flick who does have memories and experience with Bayern so this can be a reinforcement so that Barcelona can change the results of the match so that they are not the same as previous seasons because Flick must know the outline of Bayern's attack pattern even though their coach is new but the management structure is not much different and the composition of the players is also almost the same so that Flick can at least feel what Bayern will do later.
Bayern when meeting Barcelona always looks great and invincible so this can be a good situation for Flick at this time to prove that he is able to bring Barcelona in a better direction.
yes it is a past that cannot be forgotten, but that is a long time, and we always have the possibility in the future, and you are right that Hansi Flick has been in Bayern Munich, but it is in 2019 so it has been long enough, the year will definitely many changes and at that time also Hansi Flick if I did not forget he was only an assistant coach, but more or less must have a little experience and secret that is still used by the Bayern Munich team in making a game strategy, so this is quite interesting for us to see The match.