I have a PS5 and experience the same matchmaking issues you are having. Every next gen player does, whether they realize it or not. It is most evident in Trials and Survival. My team and I played the same team in Survival three times in a row just a few days ago. We were fine with it because we easily beat them all three times, but I do feel bad for that other team. I've been on the other side of that quite a few times too. It sucks. The only thing I can say is I expect the issue to resolve itself somewhat once crossplay is enabled. If there's still a new gen/old gen separation, it will still at least mean that PS5 and Xbox Series X/S players will see each other added to their matchmaking pools, making this a less common scenario. I don't like that they split it to begin with, but there is at least a chance that it improves at that point.