I agree with you, nobody should conclude on the inability of PSG not winning the champions league as a result of them not having a star players or professionals as the case may be, PSG has had a bad experience having quality players who couldn't help them achieve the UCL trophy all through their time they can not afford to bring in more star players when are rebuilding the team with young vibrant players.
The current coach of PSG Enrique understands his work as a good coach and he has done a great work in the team from their performance in the league so far it will only take him some time to continue the reign as the ligue1 champion while he also push the team to achieving the champions League trophy as they better their performance.
I don't believe that PSG problem has been the absence of star players, remember the MNM, Neymar, Mbappé and Messi, and yet, they couldn't achieve anything after their era, I kind of think that their major problem has been with getting the right coach to get them to the promise land and to bring the trophy home. Now that they no longer have star players in the team, I wonder what would be their faith going forward.