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.
The clubs will do what is also in there own interest, if they should have an injury before the main season starts, that will affect them because they know it will take time before they can bounce back after the injury and their role will be very important when the main season starts. They won't be in the healing process when the games are already serious. And if it was el Classico it would have been tougher than this, but since it was a preseason game it was taken lightly. Their play was not bad playing under Hansi Flick it was impressive play and it shows that they are adapting gradually. And I know their will be more improvement coming from Barcelona in preparation for next season, am in support that Real Madrid will not lose to Barcelona no matter the preparation that is been made and that is just Real Madrid for you, they are always in preparation for what ever obstacles they will face, and now they have mbappe just makes everything more enjoyable.