You didn't read 4e Dark Sun, did you?
Dark Sun in 2e was D&D that felt like a teenager embarrassed to be D&D. So, it tried hard to rewrite AD&D 2e to fit its "not D&D" aesthetic. It wasn't just removing a few races or such, it was a total rewrite of every class, race, and PC option. Even ability scores were differently done. So, Dark Sun might have used spell slots and Thac0, but it was largely incompletable with other AD&D supplements.
4e took a different tack. They didn't include some races and divine classes, but the vast majority of 4e's PH options were allowed mostly unchanged and fitted into the setting. Things like tieflings, warlocks, spellcasting bards, monks, and other options were canonized into the setting, and some 4e Dark Sun options (Drey, Half-giants) became reskins of existing races (dragonborn, goliath). It was a major break from the 2e version of the setting (and in the process also reset the timeline back to the original era) and it got a lot of praise and hatred for it. (sounds familiar...)
The core of the setting still existed: psionics, defiling, survival and brutal landscapes are all there. But it isn't going to be the 2e Box Set redone like how VGR isn't the 2e Box set redone.