I agree with you. Hansi Flick is trying to take Barcelona to a better level. They may not have done so well last season, but they are preparing themselves to be a strong opponent for next season. Adding Marcus Rashford to the team to maintain possession in the midfield and increase the strength of the attack should be considered an effective move for Barcelona.
I especially think that Barcelona is a balanced team compared to Real Madrid because they are determined to spread the individual performance of players at every level on the field.
Of course, no doubt, Barcelona will never be in good form without Hansi Flick. We saw the good job he has been doing since his arrival at the team, he boosts the players' confidence to play against any opponent because the Barcelona we watched last season was not the same Barcelona of the previous two or three seasons, the players improved as a result of the new manager's effect. Raphinha was also out of form, but after Hansi Flick took over as manager, he improved better.
However, Barcelona was in better shape than Real Madrid previous season, and everyone was shocked when Barcelona surpassed Real Madrid. Barcelona was ahead Real Madrid last season, but we can't be sure if it will continue next season when they just sign Rashford to improve their performance. Barcelona has a strong attacker, but we must remember that they have a poor defence that can concede goals.