The problem for Barcelona is the lack of discipline of the players because seeing from some crucial matches that occurred such as when facing PSG in the Champions League quarter-finals and when facing Madrid in the final earlier last month we know discipline is the biggest problem where players always make mistakes that lead to red cards which in the end it hurts Barcelona.
I quite agree with this because indeed their problem lies in discipline because in terms of current performance after several problems that occurred in the end Barcelona can still play well and their problems in terms of attack and finishing can finally be anticipated.
However, the problem of discipline and unnecessary fouls seems to need to be given greater notice because as you said, they have been disadvantaged several times due to red cards received and the last match against PSG should be a situation that should be given special attention so as not to let Madrid's fast counter-attacks be thwarted by fouls that lead to cards.
If things like this still happen then don't expect Barcelona to be able to provide resistance because we know that although Barcelona's style of play certainly dominates with its tiki taka but when it comes to the quality of attacks, Madrid can always do the best with its counter attacks.