Paris Saint-Germain became complacent in the final match, and Chelsea punished them. Furthermore, they outplayed Paris Saint-Germain. They capitalized on their strong positions and managed to score three goals against their powerful opponents. I believe the French manager's actions were unprofessional. Ultimately, we don't know what will happen in the future; perhaps they will face Chelsea again and be able to beat them. They should look within themselves and consider why they lost the match. They gain nothing by attacking their opponents and must bear the consequences.
They were full of themselves after defeating the top teams in Europe and so they become reluctant and felt Chelsea wouldn't be a problem for them and so the Luis Enrique went on with their normal strategy without analysing how Chelsea could come at them. Enzo Maresca studied his opponents well enough and prepared his players for the game. Chelsea knew their weakness and capitalized on it making them the world champions. As professionals you should be able to work on your emotions and not react when you're triggered Luis Enrique knew this and so he should face the consequences of his actions. Hitting a player is really wrong.
About the lack of competition in the Ligue 1, I don't expect it to change ever under these conditions. Indeed there is an insane gap between PSG and the rest of the teams...
Unless another team gets bought by Sheikhs, there won't be any team to put up a good fight against PSG. Do I support the idea of teams being bought by them? No, I don't.

But this is the reality of today's world.
You see that no European team is able to race Saudi teams for player signings as well.
PSG is just like a big bro to every other team in the league that's why there is no competition. Other teams don't have the money like PSG they can't afford to sign top talented players that's why they can't compete.
You're right football nowadays is ruled by money, if you don't have money you can't get top players to play for you. Some of these small teams are comfortable with their business of getting inexperienced young players and groom them so they can sell to the top rich teams.