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There were lots of controversies tied to the Barca vs Inter match regarding the referee and VAR officiators ruling against the Catalans. But that's not enough to judge what results would have came out if Barca played PSG. Inter, on the other hand, playing results proved to some Barca fans that they wouldn't have crossed to the extra time if the refs were just, yet it doesn't outrule the fact that Barca didn't play their best with inter, and may have lost to PSG too. You have to get over it. PSG deserved the trophy.
Now it's all gone and Barcelona have to pay the price for their own mistakes because they couldn't hold on to the lead. Inter play more motivated when they're ahead, they're better at defending, but if Inter go behind first they'll be more disorganized. PSG really know how to put Inter under pressure and how to make Inter play more openly, it's all because PSG took the lead first.
Barcelona are good at building attacks, but they are not good at anticipating Inter's attacks. Barcelona conceded easily against Inter and that is something that is not balanced considering their goal production. If Hansi Flick wants to improve, then he must be able to strengthen his team's defense system so that there is a balance between attack and defense. I want to see that next season, hopefully he succeeds.