PSG is only have few star players, while Real Madrid have eleven star players.
But still, having many star players does not guarantee the team to get the trophy easily but at least, if it is associated with Real Madrid then of course the results are still possible as expected. Also, when PSG had Messi and Neymar at that time, basically it was not only about the four players you mentioned because basically PSG had star players in almost all positions from goalkeepers to strikers.
Therefore, basically PSG also has star players in almost all positions but still PSG failed. Therefore, above I said if it is related to Real Madrid about many star players, then it cannot be equated with other teams that also have many star players. Because after all, Real Madrid has been successful for a long time with many star players in its squad, while other teams can be said to be just starting out and therefore other teams that have many star players still find it difficult to get the most prestigious trophy in Europe, unlike Real Madrid who continues to succeed with many star players in its squad.