I actually do not take the results of preseason friendly games serious because of the fact that players most times do not give their best in other to avoid being injured but if there's anything I agree with your submission about Barcelona's performance in their El Classico game against Real Madrid last night, it's part that you highlighted how they're playing to the tactics and style of the club's new manager Hansi Flick. The players like you rightly said are adapting too fast and that's good development for the club as they continue to prepare for next season.
That being said, I'm still very much convinced that the current Real Madrid team will not lose to Barcelona if that game if last night was a competitive one.
Regarding the official La Liga competition, it is clear that we cannot relate it to this friendly match. Because, regardless of who wins, it still cannot be a reference that Barcelona can repeat the same thing in the La Liga competition. This match is just a pre-season event and nothing more. However if I have to judge, I admit that Barcelona is indeed superior, effective, and dominates the course of the match. Real Madrid whose front line has not been able to find a match with each other so that it loses direction in organizing attacks, especially Endrick. The entry of Vinicius further clarifies that Real Madrid's attack line depends entirely on him. Meanwhile Barcelona is more creative and hardworking, all the young players fielded by Hansi Flick are enough to overwhelm Real Madrid defense.