I don't think Messi has underperformed in PSG. Considering his age, he has contributed immensely to the success of the club. The only reason why the fans or management thinks that he has not done enough was that they failed to win the Champions League this season. The club would have been singing praise songs about him if they had been crown the champions of Europe.
After Messi came to PSG, the club has been knocked out of the Champions League in the 1/8 final for two years in a row, and Messi himself plays in stealth mode in important games. By the way, there are also two departures from the French Cup in 1/8 in a row. I do not think that such a result was expected from such a promoted player as Messi. It's clear that football is a team game, but it just so happened that when a team plays well, it becomes Messi's merit, and when it's bad, it's not his fault. But for some reason PSG fans don't want to eat that shit, hehe.