For Luis Enrique, these players are crucial young talents. He wants to showcase them in the football world. Paris Saint-Germain is a crucial location for this. Paris Saint-Germain, which will always be successful in the French League, could easily use these players in rotation in the French League rather than in the Champions League.
Yes, young talents mean a lot during the league stage. Because young players tire later, which means that you can play them for more games, and because they are playing in many competitions, that means many young talents will get many playing time. Some of them are already getting a lot of minutes because they are the main players, but there are some benched ones who will get time when other players start to get tired.
Louis Enrique knows that a big club is only possible by having multiple talents, you can't really do it all by yourself, you have to handle it better. If you do that, then you are going to get amazing results because a big depth allows you to stay a good team and play against everyone for 60+ games a season.