You kidding? It's a feast for haters. I mean, they barely have any business outside shitting on internet, not even playing some game sometimes, something has to feed them.
It's literally impossible to make it easier, you develop the game for Series X, once you're ready to make the Series S version, you test it on the same Series X using the Series S profile and adjust graphical features accordingly. There's no separate SDK or development environment for Series S, you only develop for Series X and adjust as needed. Modern Vintage Gamer said so in an interview but can't find it anymore... It wasn't on his channel.
I think that can be a factor considering more devs learn to work with high level languages and dev envinronments instead of "coding to the metal", but AFAIK there's a seniority lacking problem in the industry, developers with greater experience migrate to other better paid, easier to work on and with better work/life balance industries like Web/mobile apps dev.
IMO it could also be that software these days is just TOO COMPLEX, one single thing requires so much knowledge to implement, test, etc. to avoid breaking things and the fact that publishers rush releases don't give devs enough time to make a quality product. I don't think a single high skill professional like those in game industry feel right by leaving half assed work in a production build.
1. Do you mean this dev? Well, there are a couple of them actually, that was before the console came out:
Source.
A couple devs don't mean the entire studio, which BTW, had another person saying good things about the Series S in that article.
2. We already have complex games running on XSS or about to release. Even the RT only Metro version... I mean, are you saying that BG3 is more complex than Starfield gonna be? What about the dual world rendering in The Medium?
3. Ok, games are gimped on XSS, which means only XSS version is affected, nor XSX or PS5 seem compromised beyond their own limitations.
4. Yes, I don't have to "believe" XSX/PS5 limits are being pushed all the time, you just have to see current gen games like Jedi Survivor going below 1080p internal resolution in current gen consoles, other games won't release with 60 fps mode and when they do (like Requiem), they're just too compromised. They don't need the XSS to limit them, devs are hitting their performance ceilling consistently on those consoles and that's before they think of XSS.
Again, that's a XSS version being gimped, not XSX/PS5 version being gimped because of XSS. For XSX/PS5 owners, XSS won't matter at all.
BTW, most of the reason why XSS don't get RT is because of these expensive hybrid lighting models, that's because RT is currently an expensive gimmick no console should try to push. If devs want to make even XSS RT performance somewhat decent, they should make something like Lumen or full RT like Metro Exodus, which runs on XSS and performed/looked way worse when they just had "RT on top of rasterized" lighting model. I'd opt out of using RT this generation at all though.
Nothing compared to PS3 AFAIK, XSS doesn't even have its own dev kit, you develop for XSX and adjust graphics accordingly on a XSS profile on the dev kit.