Faolyn
(she/her)
From my (limited) knowledge of Dark Sun--which does not include anything from the novels or adventures--slavery was just treated as another part of the setting, not as an evil to be fought. I think that's the actual big issue with the setting. There's little the PCs can do about it, especially at early levels.Regarding Dark Sun and "problematic" elements.
I obviously am a big fan of D&D becoming more inclusive. However one thing I am a bit annoyed with sometimes, is if depiction of a bad thing is conflated with an endorsement of the bad thing. Fiction can and should be able to deal with potentially upsetting topics, and it can do so without endorsing them, it can show how they are bad and in a RPG offer catharsis by allowing the players to fight and overcome them. I don't think unpleasant things existing in Dark Sun is a similar sort of thing that sexism that plagued the early products.
Now I get that D&D is a mass market game aimed (at least partly) at kids and teenagers, so I understand that the core game needs to be pretty "safe" in many ways. But I think it would be fine if a separate supplement, that people would have to opt in (like Dark Sun setting supplement) dealt with some darker themes.
If a new edition of the setting was presented as one where fighting against state-sanctioned slavers or sneaking slaves to a free city was a typical adventure hook or character goal, then I don't think that should be an insurmountable problem. The game could have upsetting issues and would be officially showing them as bad.
The psionics would still be an issue, but that's another story.
Personally, my biggest problem with the setting is that there were a lot of tiny hints that it was supposed to be post-apocalyptic, but it never really leaned into that.