I absolutely agree with the opinions about Messi that his era has ended. Barcelona were really struggling already while he was playing there. I mean the last year he played for them for example. Messi was trying to take full responsibility for carrying the team but it wasn't helping them still. His performance was still great then though but he hasn't been like shining at PSG so far. He had serious problems on adapting to them in the first times but he is better these days. He is still not like the old Messi but it is normal as he is aging also.
I don't think Messi's era is over yet he can still play 2-3 more years but for his contribution to PSG, the quality of Lionel Messi is still not visible, but it's different from the Argentine national team where his contribution really gives positive results for the Tango Team, because we know that Messi is still under the shadow of Neymar and Mbappe so that it affects his performance at the club located in the city of Paris, perhaps his departure from Barcelona is inseparable from the financial crisis experienced by the Catalan club so that they can no longer afford to pay super expensive salaries.requested by Lionel Messi himself so that Barcelona decided to release him to PSG in the midst of Barcelona's own financial crisis
The age factor has indeed been a factor in the decline in the appearance of several players, including Messi.
I understand perfectly well that it is already possible to make whole scientific treatises about the bad luck of a team like Paris Saint Germain and about the luck of a team like Real Madrid, but still it is a kind of reproach to both that they allowed their fate to plunge into luck. But it is for this that the candidacy of the person who occupies the captain's bridge plays a very important role, so some claims against Pochettino are not without reason, because the composition of Paris Saint Germain and resources are much higher than average. 
