This. I hope people don't get stuck on edition-specific issues ("Half-giants should be Large! Sorcerers do not exist! Tieflings are not a thing! Psionics is not magic"), and instead focus on the major themes that made Dark Sun great.
I don't care if they use goliaths instead of half-giants, or dragonborn instead of dray, or if the Psionicist uses PHB spells (I actually hope it does, I don't want to learn a new set of rules).
Art by Brom would be awesome, but I don't think this is happening...
It ain't that easy even with your enthusiastic attitude.
Environment challenges are nullified or heftily weakened by some classes (monk, barbarian, shapeshifting druid e.g.)
Defiling: It is evil. A sorcerer if the concept would exist in Darksun could not be anything else than a defiler. He would lack the subtlety and intelligence to cast in a preserving way. He does not fit into lore in any way, and would not survive for long. And he is also one of the classes (Red dragon sorcerer) who nullifies the extreme heat conditions with a whim.
Psionics is not magic, it is quasimagic, pure power of the mind. It never requires any components at all.
It is best compareable to at wil lcasting of some mobs if you want to compare for what ever reason.
For halfgiants use permanent "enlarged" humans, you do not need "goliaths" the naming of the later is a joke imho (it would be like naming barbarians Conans or wizards Merlins).
The challenge for halfgiants lie in their size requiring more water, bigger equipment and they do not fit through anywere. And they got shifting alignment issues. But they are tough, very tough.
Tieflings require demons or devils, which requires abyss or nine hells. None of these exist in darksun so why retcon? Do you also need aquatic elves there? No? Why? Does it not fit? Because no big bodies of water for them to live? See, same goes for tieflings. Because no progenitors for them to justify their existence.
Edit: same goes for dragonborn. No Dragons there, so no dragonborn. The "dragon(s)" of DS are totally different thing than in other gameworlds.
For all of you who want to play kitchensink in the desert with stoneage weaponry why don't you ask for FR accessory "Anauroch -10000 DR" including every race of the multiverse and all classes