Yes a win is a win but sometimes the performance of a team that got them the win matters because sometimes that could indicate if they were just lucky or deserving nevertheless they are awarded the complete point even if they were lucky or not but for the purpose of improving it becomes important they take more of the performance that got them the win because against some other teams they my not win with same performance, and yes not all the times favourites gets to win, sometimes they do loose games.
I have no doubt about that, in fact that victory has oxygenated things well for the team because they lost against Arsenal, and now they lost 2-0 is quite a lot, for a team like PSG it is an open score and leaves much to be desired, of course we are used to seeing PSG with a bad reputation where they win and win, but seeing it from the better point of view they have to improve I think they need big-time players, famous players who are good, in this case they really need an Osimhen, players who make the difference and who have a hunger for victory.
At least PSG also did not make many purchases in the last transfer market and with results like this, of course PSG still needs some new players to be brought in of course to make player rotation to support the team's performance to remain good in all competitions. Because after all, if the team succeeds in the domestic league with good dominance in several consecutive seasons then with impressive results in the domestic league, it is a must for PSG to also succeed in the Champions League stage.
Because after all, basically PSG is a team that has advantages in many aspects including squad, coach and also financial and maybe some other things. Thus, PSG must be able to become a team that can get good results in all competitions even though they don't get a trophy, but at least PSG can show good results in the Champions League as a representative of the best team in Ligue 1.