Feels like having great players doesn't guarantee you any success, also not everyone season is like the next. Real Madrid knows how to play in this tournament, even in the years they are not amazing, they still managed win and they will keep being that good because they bring in the younger players at the bench to grow up with older ones getting the title, so they put that UCL title winner mindset into the younger generation, and when older generation retires, the younger ones already have a few cups with them.
So all in all, I think we should consider that PSG İs missing that winning culture, the stress they have when they are at knockout stages of UCL is showing and they always miss shots that they would normally score.
Mentality and consistency are of course the most important thing to compete in the Champions League so far, we can see how the mentality possessed by Madrid so far has been able to make them continue to dominate in the Champions League, besides that the regeneration carried out by Madrid today is of course one of Madrid's ways to continue to transmit their champion mentality to young players, So it is not surprising that so far Madrid has always combined young and senior players in every match they have played, and this is in contrast to PSG who indeed hope to achieve instant success by continuing to rely on star players so far.
In my opinion, to compete in the Champions League, of course, PSG must start changing their mindset and be able to trust a process to achieve success, since becoming a rich team until now, of course PSG continues to rely on star players to be able to get the Champions League trophy but failled, so I think, it's time for PSG to start trying to build the foundation of the team by relying on young players so that it will slowly be able to improve the mentality and also the stability of the team for the long term.