The split performance for "next gen" is a pretty major compromise to the ecosystem. The benefit of consoles is the single target you can optimize hard for. Different GPU can be tuned, but different CPU is an issue for demanding loads.
X/S is apparently a big difference. But Xbox requires a game tomrun on both with the same features.
So if Larian wants split screen and only one can handle it, their choice is releasing a bad version on the weaker Xbox, or spending a lot of time trying to make it work.
All because Xbox is in denial about what "next gen" really means.
I thought they release the weaker S series to sell cheaper to a lot of people. I wouldn't have bought it, and would have got the X version if I was going to get one. I think it was $100 cheaper?