What's worse, the other teams in Ligue 1 are unable to put up a strong fight against PSG in the race for the Ligue 1 trophy. Thus, even though PSG is the best team in Ligue 1, but in reality PSG is still veryweak if PSG are in difficult competition with teams that have another great level in the Champions League. So yes,it's not wrong if you say that Ligue 1 is the weakest league compared to other big leagues in Europe.
I agree with your opinion that Ligue 1 is one of the weakest leagues among the top European leagues. In fact, we can see how dominant PSG is in Ligue 1 and how other teams are unable to compete with them. This is different from other top leagues such as La Liga, Premier League, Serie A or even the Bundesliga which have rivalries in competition. But I think PSG is not a weak team when compared to teams from other leagues. PSG dominates Ligue 1 because other teams are weaker than them, but I see PSG can also become one of the best teams in European competition. PSG made it to the semifinals in the UCL and that shows their level. It's just that they have never been among the favorites to win the UCL in my opinion.
the problem with the other Ligue1 teams is that they are teams that don't make big investments in their squad, I don't know exactly why Ligue1 teams haven't made big investments in their squad, but I can assume that the reason is a lack of money, the Ligue1 teams There has been no management that makes an effort to bring in a good coach and a good player negotiator so that they can sign good players for a low price, what I have seen are signings of players who come from Africa but who cannot stay in Ligue1 for a long time and when they go to other big leagues they start to shine, it's funny that the same African players who are shining in other leagues when they were playing in Ligue1 didn't shine
There are things that France's politicians have done that make good players stay away from Ligue 1, for example a very recent case was this bad behavior by the mayor of Marseille
The mayor of Marseille has demanded that his city's football club do not sign Manchester United forward Mason Greenwood.
Marseille mayor Benoit Payan has said it would be "unacceptable" if Greenwood ends up joining.
source: https://www.skysports.com/football/news/11095/13175753/mason-greenwood-transfer-news-manchester-united-agree-26-7m-deal-with-marseille-plus-significant-sell-on-clausethe politician is trying to give orders at a club, he is trying to get involved in sport, these types of attitudes are not good, when neymar played for PSG there was also a mayor who constantly complained about the things that neymar did in the city, the french fans didn't either help, they were constantly criticizing messi and neymar and that made the players leave. France needs to separate politics from sport and French fans need to start being humble