PSG team could not use a player like Lionel Messi well. One of the reasons for this is that the coach of the team does not have enough knowledge of how to use a player like Lionel Messi.
So far I have never heard anyone say that to PSG except you today, because if you say the team coach cannot use a player like Lionel Messi, it means that other players cannot be used better by a coach. But when there was still Lionel Messi at PSG I think the coach put him in a very suitable position so that PSG can continue to win trophies in Ligue1 even though PSG have never succeeded in the UCL as long as there was Lionel Messi in the squad in the past.