Going by the published material, #DarkSun seems to be very much designed for city campaigns. (No descriptions of dungeons and wilderness sites.)
But it also really does make a great setup for a survival sandbox campaign.
Can't stay in the cities because the templars are always serching for suspicious strangers and escaped slaves.
Can't stay in the desert because you need new supplies.
A constant need to keep moving towards new dangers.
ADHD&D of the Day:
I like #DarkSun, but AD&D is incomprehensible, 3rd Ed. is way too complex, and 5th Ed. has no psionics.
But I think #Dragonbane could be a fun game system for an Athas campaign with a bunch of custom spells.
@Yora there a few good options for psionics in OSR books of that's of any interest?
@Yora I have the basics of a psionics system put together, based on the Warlock. You want a look?
@libraryogre Maybe, one day. Once I have my other eight planned campaigns completed. 
@Yora but think of the inspiration it could create for the ninth! ;-)
@Yora There's a Savage Worlds hack!! It's perfect for running the more Sword & Sorcery interpretations of Athas
https://geekken.blog/2014/05/14/savage-sun-a-savage-worlds-conversion-for-dark-sun/
Reddit User #Lixuni98 made an #OSE Version of #DarkSun.
Here’s their latest version.
Also, they’ve converted Spelljammer to OSE.
https://www.reddit.com/r/osr/comments/157om2t/dark_sun_ose_revamped/