Before PSG got to this level where they are now, someone took the risk to invest in them and got them to this place so an investor can take the risk upon teams like Monaco, Marseille and any other top Ligue 1 team, only that they have not looked like they have the potential which will propel the investors into attempting to invest their funds since they are sure of returns.
Paris Saint-Germain got big investors and these men are not joking, they're all up and ready to smash the big winnings this season. We could remember vividly, Paris Saint-Germain have been the bigger team here, coming out and winning matches with ease efforts, this is the type of PSG I want to see, there have been absolutely no changes from Paris Saint-Germain 10 years ago and today, they remained the leading team and winning games is much more easier. Paris Saint-Germain will be getting better and knowing how tough these games become and oppositions they faces, it doesn't matter because Luis Enrique is there to make winnings important and easy to accomplish for them.
Defending the League 1 title will not be difficult for them, especially after they achieved their target last season when winning the UCL title, of course, it will make the team's confidence much higher, and also if you look at the league 1 teams, there will be no one who comes close to PSG's strength, so I think PSG will still be the same as last season, namely focusing on the UCL competition and for the league 1 competition they will be able to win it easily.
You're right defending the french Lique 1 will be like an easily prepared meal for PSG,they have been winning it back to back for decades without any major contender going up against them for the title. If it's just the french domestic Ligue 1,PSG will continue to reign supreme until otherwise. The otherwise is if other clubs in the French Lique 1 starts buying expensive and quality players to strengthen their squads in other to compete head to head against PSG. It will so interesting if there's a club that can compete with PSG for the trophy. However the UCL is not the same as the french Lique 1 where PSG have completely made as their inheritance,it so uncertain if PSG can managed to win it back to back because it's a league of champions.