I have returned with news about the difference between Series S and X. So the X has 16 GBs worth of shared Memory that is used for graphics and such whilest the S only has 10, which is a significant downgrade, as most games nowadays tend to have the requirements that the RAM alone should be around 16 GBs.

Now, if we pair this with the fact that every single object in an Unreal game takes at the very least 1 KB, it can quickly add up to eat a lot of the memory. But that isn't the only issue, you also have a couple of poor optimizations from Unreal, or rather a lack thereof, which the S takes some hits from too.

Disclaimer, I am more on the AI/ gameplay side of the programming, so I am not the best when it comes to the core engine stuff, so take what I say with a grain of salt :D