You will notice a decrease in performance on the Series S. It really just depends on how much you are willing to spend. It’s hard to say how much of a difference there will be because every game and developer is different. I play MSFS on the Series X but have not tried it on my Series S yet. I would expect a decreased resolution on the Series S or some other measure of decreased performance. Maybe less anti-aliasing? However, the Series S is an unbeatable Gamepass machine for super cheap. As I mentioned below, I got my second Series S for $100 on Facebook Marketplace. Have a look at some YouTube videos that discuss this very topic. Here is a direct graphics comparison for MSFS!
Love this series. Richard is the best.