What Enrique has done is of course right because after all the main focus of every season is to win the Champions League, while for Ligue 1 of course there will be no team that is currently really able to break PSG's dominance in winning trophies, what you say is true, currently PSG who rely on Mbappe is certainly no different from Barcelona who rely on Lamine Yamal and Lewandowski on the front line, currently the chances of both teams to win the game in my opinion are 50/50, because indeed the quality of the two teams is quite balanced and maybe the strategy and tactics of the two coaches will be a winning factor for one of the teams between Barcelona and PSG.
Enrique can focus on their biggest ambition to win Champions League with the fact that they are leading with a big gap in the league. Their dominance in Ligue Un will allow them to relax a bit in the league games for a while. Their reliance on Mbappe can be just maximize in just Champions League games because, in Ligue Un, they can use the squad depth to secure the league trophy.
Barcelona have no reliance on certain players, but their collective effort could not be at their best if one or two of their regular starter are not available. Their defense is not the best at the moment that make it vulnerable if they have to face the main front line of PSG. Therefore I don't think it would be 50/50 chance for the game, the individuals brilliance give an edge for PSG. The tactics and strategies of the coaches will take a big role on who will win the game.
To be honest, there are always doubts when I look at Paris Saint Germain, I don't mean to belittle them, but every time they are in the Champions League, I don't think they are fully ready to compete in the Champions League, especially when they rely on certain players, in this case Mbappe. If Mbappe's movement can be stopped by Barcelona, then they won't be able to do much in the game, because Mbappe seems to be the life of Paris Saint Germain's game.
Meanwhile, the opponent they will face is Barcelona, who play more collectively as a team. Even though their chances can be considered equal, these 2 matches will be very difficult, especially if they cannot win the match in their first leg. If they can win, then it will make it a little easier for them, and if they lose or draw it will make it even more difficult for them.
Paris Saint Germain has always placed the Champions League as their main target, but so far they have failed.