There are very high-quality young talents in the French league, but PSG is currently working so well that it is collecting young, promising 15-16-year-old French players into its infrastructure and releasing them to the market a few years later. The latest example of this is Zaire-Emery. That's why other good young players cannot leave the infrastructure. When teams like Monaco and Marseille move away from their policies of transferring good players, this becomes an inevitable end. In addition, PSG is so financially strong that the team that can compete with them is not located in France.
It is undeniable that French young talent is actually very good, and it is not uncommon for young talents to be priced high when going to other leagues, just like Camavinga or Tchouameni, who were brought by Madrid from Rennes and Monaco.
If from the beginning PSG did that and were not too obsessed with becoming galacticos in Ligue 1 I think they would have a lot of good talent especially since France is one of the countries known for its quality players.
They have the resources, they also have many opportunities for that but they don't see good potential from the start. But it seems that now PSG really wants to change the image of the club at this time because they realize that their approach by looking for star players who are old enough cannot be forced in the Champions League competition so starting from scratch by looking for a new scheme is actually a very good thing for PSG.