No it doesn't depend on Luis Enrique only. There is a reason why teams from leagues like Portugal, Eredivisie, Ligue 1 and others almost have no chance to win the Champions League. The main reason is that these teams are not good enough and if they are in regards to the players they have and the quality they potentially can bring onto the pitch, then the teams don't get challenged enough throughout the year and are playing against far inferior teams all the time. But then out of a sudden the next opponent is called Real Madrid or Manchester City and that is when they haven't developed the tools during the season to deal with the problems that these world class teams can create for any opponent. PSG won't win the Champions League and I doubt that Enrique should be blamed for it. It's never the best idea to buy a club in a weak league, invest billions and then hope to win the Champions League.
I get your point, but PSG is among the elite teams right now. They have the players and they have what it takes to win the Champions League. They've just been run very poorly. It has nothing to do with the league they play in. A good team is a good team anywhere, the league doesn't matter. If they are very well managed they should be able to win the Champions League.
Manchester City is almost the same thing with PSG, the only difference is Man City won the Champions League last season which is about 6 seasons after signing Pep Guardiola.
My point is, that it takes time.
It's worse for PSG because they don't know how to manage the club. They don't know how to sign players. The fans decide a lot of the players they sign. When they had Messi, Neymar, and Mbappe, they had a very average midfield. Good management should know that the team needs to be balanced.
A well-managed team would have let Mbappe go last season instead of giving him such a huge contract. They keep building their team around one man and it has never worked.
They need to have a balanced team where the team depends on the team to succeed. One man can't carry a team except you're Lionel Messi. Even Messi needs support, to be honest.