Lionel Messi going to PSG won't do much in my opinion. Because the rest of the players in the team are failing to give enough support to Messi. Lionel Messi If the team players are able to deliver the ball strategically, then Messi will be able to give PSG something better.
Great players like Lionel Messi also need other players who can provide good passes for him so he can give better results for the team in every game. Because he also can't do much in the team if he has to rely on himself in every game, so it would be better if PSG could score better midfielders and wings so that players on the front lines like Lionel Messi can be more assisted in scoring goals. And this will also have a good impact on the PSG team itself when competing in other competitions such as the UCL next season.
Lionel Messi has not made a big contribution to PSG so far so I think even though Lionel Messi leaving has not made a significant difference to the PSG team, so far the PSG team has been very solid because they have very good players on all fronts and this PSG team does not rely on any one player only.
and for the front line of the PSG team I think Mbappe is a very influential player compared to Lionel Messi.
Lionel Messi is an old player, I think for progress the PSG team has to let him go and find a younger and better replacement.