Barcelona ain't that tough as you think they are.
Yes bro, they are not invincible, whether they think they are invincible is another thing, maybe they put it in their heads to raise their morale or their self-esteem, but in reality it is a team that is doing well, but not that well, if not they would have won the UCL, experience in football will always prevail, for me there is no other way, that is why Inter beat them, they left them on the field, in fact I think that next season they will not be as lucky as they were last season.
I thought I am the only one that sees them that way, I know they have improved in their game a lot but I don't think they are invincible as people see them. I even believe if they have played against PSG they wouldn't have won because of their style of defending. The high line defending is why I don't think they are not invincible because the rate at which they concede is just too much and they won't be so lucky to score as many goals every match. Real Madrid poor performance made it looked like they were invincible, Real Madrid lost all matches against them which was what made everyone think they were invincible.
Next season will be more challenging for them and they won't be as lucky as they were last season. Teams would have come up with ideas to counter their high line and defend against them better.