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I don't think PSG will ever again be able to win the Champions League after they were unsuccessful in doing so last season. Despite having Messi, Mbappe, and Neymar as their top three essential players, they were unable to advance past the semifinals of the Champions League. It's heartbreaking to think about because everyone believed they would win the Champions League trophy based on their frontline strikers. I was one of the few who predicted that PSG would win the Champions League, not even anticipating that Manchester City would shock everyone by winning the treble trophy last season. What I have in mind was PSG is going to win UCL from the start of last season but they failed woefully.
Too easy to say, but you've left a lot out of hand here. Barcelona has a golden generation with Pep Guardiola, but they can't always win the Champions League title. Bayern Munich, Juventus, Real Madrid, Liverpool, Manchester City also experienced it. PSG are not the only team that have failed to win the Champions League title when their squad is filled with star players, it is clear that many other teams have also suffered the same fate.
But why is it only PSG that attracts attention and continues to be talked about, it is something that is considered a trend when PSG have spent a lot of money to win titles. Money doesn't guarantee success if management can't manage it well, even if a team has a luxurious squad like PSG.