Gaming

I'm lazy so I'll just link to my comment on this very thread.
I haven't actually reinstalled MSFS since upgrading from a Series S to a Series X earlier this year, so I can't confirm whether stuttering on the X is still a thing, but performance on the S was pretty much flawless. I didn't install Lost Odyssey on the S back when I had it so I can't tell, sorry!

As for performance and graphical fidelity in other games, it will vary, and you'll likely notice it, as did I, coming from a PS5 - especially on 1440p/4K set. As a game pass machine though, it's really hard to beat price-to-performance wise.

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!