When you have a team like PSG, it's hard to have a defense. Why? Because other teams usually close down, which means that they will be defending with at least 7-8 players, maybe who knows it could be more, I have seen all 11 players at their own half as well.
This means that you can't just attack with 3-4 players, that's not going to be enough and that's going to cause you some troubles, so you are going to end up putting all of your 10 players in there passing trying to find an open pass to shoot. This means that your defenders needs to come all the way up to the half way line, and that means when there is a counter attack you need to be incredibly fast to defend that player and try to stop them, it's a tough job.
The main problem for PSG to not getting good results in the past was mostly because of the unbalanced team they had, PSG had the best forwards however there was a negative atmosphere in the teams but they had the best forwards and they didn't get good results because in the other positions, and especially in the defensive line they didn't have good player, I think this teams still don't have good defender and you can see this problem when they are going to play in the Champions League against strongest teams.
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It is a problem that is likely to persist. It could turn out that their defense needs some time to perform well together, but I doubt that they are better this season than last season. But it will still be enough to win Ligue 1, which is really just a standard goal they should and must have as PSG. I don't know how much more expensive their squad is, but it would be a shame if they didn't win the league in the end. But the trophy they really want is the Champions League and Mbappe won't be enough to win it.