We have been noticing PSG's weakness in defense and weakness in midfield for a long time. The weaknesses that we as ordinary supporters are clearly noticing may not be visible to the PSG management. If the management could see where PSG's weaknesses are, then maybe the management would have improved in that area. You go to war only your air force is strong but your defense is not strong so no matter how much you attack with air force the opponent will enter your area and destroy your area. First you should secure your own area without attacking other's area, when your own area is secured then your performance in other's area will be better.
We have clubs that are doing exceptionally brilliant and also clubs that are struggling. Everything will play out nicely whenever PSG falls back to formidable action in Ligue One, but their main focus is top tournament like the UEFA Champions League. PSG are strong enough because they have the necessary players available but It happens this team doesn't have the ginger morale to top their game. Paris Saint-Germain have weaknesses and its their defendlines, they're unable to match up with strong competitive race but Luis Enrique is working on this weaknesses to enable him and his team become promising in tournaments.