I agree with you that the tougher the competition in the domestic league, the more motivated a club will be to improve. I'll take the example of the Premier League for example, they get tough competition from all clubs, we can't easily predict matches there, because there clubs that are considered weak can become a stumbling block for big clubs. And we can see what they can do in European competitions as a result of the intense competition in their local competitions. Unlike Ligue 1, we can see what they can do in European competitions, especially the Champions League. They can't say much there.
We can't deny things like this, because after all this is part of the mental formation that will be very useful.
That requires a lot of money though. No other team has owners like PSG has and that means we are not going to see them do a lot better. PSG has done better than other teams because they have a rich owner, which means that they were able to spend a lot of money, and get sponsorships from the owners basically, or at least their network and all that.
This made PSG richer and get all those players, we all still remember Neymar being bought for 220 million, still to this day the biggest transfer ever (though I believe it will be broken one day by Saudi clubs). So all in all I think it's important to remember that we are not going to see other French teams do that well until someone rich buys them, and PSG will stay the biggest until then.
Yes, I won't deny that money has made them what they are today, but is that the only reason why they can't impress on the European stage? Of course not. We can see from how their situation in the squad, yes they always have problems between one another, be it players with players, players with coaches and others, so with that problem their chemsitry is very difficult to create and the impact on their game is always messy. Star players will not always be a guarantee as long as their relationships are not good,