Messi had this trouble with Argentina as well, he is too used to playing in the Barcelona system and now that is a problem for PSG as well. I watched the game and when he was playing he was doing awesome stuff but his teammates do not know what to do when he is doing all those awesome stuff, in Barcelona players were used to watching messi do great stuff but they knew what their role was during the same period as well, in PSG others do not know and suddenly start watching him do great things while forgetting to play, they are too used to being a team and not messis team.
This will keep on hurting the team a lot if they keep this up, either fit messi into the team or if you really want to fit the team into messi but find a way to get together. If possessions are all "messi scores, or team scores" then they are going to keep being bad in the long run.
Building the team's game around Messi in the current conditions is a dangerous undertaking, because Messi is no longer in such a state and condition that he can still constantly make results, at least because of his age, which is becoming more and more. It is the alignment of the game around Messi that is the main reason why Barcelona's results began to deteriorate. Therefore, the best and most workable option is to embed Messi in the structure of the team game. The most important mistake of Pochettino will be if he, as the head coach, goes in the wake of Messi's wishes, because in the end Pochettino may be left without a result and, accordingly, without a job, although of course mutual understanding with Lionel, as the main asset of the team, should be at a high level.