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You are right, most of the players currently in Barcelona are players who were recruited when Xavi was serving as coach at Barcelona. So basically Xavi is the one who gave trust to the young players in Barcelona. But unfortunately Xavi may not have much experience, so Xavi has not been able to develop the young players well. But in the hands of Hansi Flick, the young players that Barcelona has can really be developed more optimally. Because Hansi Flick is of course a fairly experienced coach, so with that, Hansi Flick can easily develop the young players in Barcelona very well. Because it doesn't take long for Hansi Flick to be able to bring out the best performance from the Barcelona players. So with that, Hansi Flick really is the right coach for Barcelona.
The difference between the two is very clear to see after Hansi Flick was appointed as head coach, several players developed rapidly under his guidance. Hansi Flick has succeeded in perfecting Xavi legacy squad, Raphinha who previously lacked trust is now a new idol at Camp Nou. Barcelona game is also very different from the previous season, Hansi Flick managed to make Barcelona create opportunities, score many goals, and Offside traps that make it difficult for opposing players to enter their defense area.
Barcelona revival under Hansi Flick has forced Real Madrid to overhaul their squad for next season, bringing in several players to increase their strength, including changing coaches due to losing the title race this season.