Assuming you watch the final game between real Madrid and Borussia Dortmund in the first half, you will no that real Madrid manage to win that trophy because Borussia Dortmund players used real Madrid players like small players in the 45 minutes in the final game, but it was a surprised seen real Madrid used the second half to secured some goals that gave them victory to lifted the trophy.
If we remember the final match between these two teams, I suspect that in the first half Ancelotti let Dortmund play more freely. The goal is for them to be careless and ignore their defense line. I mean, so that Dortmund doesn't play defensively. Or, another possibility is that Madrid is a little pressured by the strategy implemented by Edin Terzic. which is unfortunate, unfortunately they had the momentum to score a goal. however, luck is not on your side. In the second half, Ancelotti started to change his strategy and as we know, Madrid eventually became champions.
If you are talking about the kylian Mbappe real Madrid coach just brought into the team, you suppose know what happened when kylian Mbappe and Messi where in the same PSG last season and this season, did they win the UEFA champions league trophy? No, which the Same thing will happen to real Madrid next season.
I agree with this one, just like Manchester City who have a very competitive squad despite the departure of several of their mainstay players. but at the same time, City was unable to defend the trophy they won in the previous season. related to what you said, Mbappe's presence joining Real Madrid does not guarantee anything about winning trophies. Apart from the fact, they have quite cool squad depth in all lines and this can be a big asset for Ancelotti when all competitions start. However, we cannot ignore every possibility and even several other strong teams might be able to overthrow Real Madrid when they meet. after all, as we know in football anything can happen.
I have that believe that Barcelona president will approve some money for their coach to start bringing in talented players in this season, because they where very close to the top in this season but they made some mistakes that made them to locked out from the tournament, which they will make sure next season be a better season for them.
Barcelona is one of my favorite teams, but Barcelona's problems are quite complex with their financial limitations. That doesn't mean I'm pessimistic, even though currently Barcelona is managed by Hansi Flick with a wealth of experience, especially when handling Bayern Munich. However, it looks like Barcelona or more precisely Flick needs time to build the team he wants. especially, if they are targeting several trophies in several competitions. I mean, Hansi Flick's journey in managing Barcelona will be winding and a big challenge for him. But, let's see their performance when the new competition starts.