There's also the unspoken conceit that the player-facing rules need not be how things work for everyone. It's easy to say that while for a PC, advancing as a cleric, preserver, or defiler is roughly equally easy, but that doesn't mean that there aren't a dozen defilers for each preserver or cleric around.
re: defilers being stronger than other casters.
You're right of course. Player rules don't need to correspond to setting background. @Snarf Zagyg covered that pretty well in one of many Greyhawk threads. I am of the opinion that the uniqueness of a setting comes across more strongly if they do, however. In Darksun's case, elements all over the setting treat defiling as though it is the most potent source of power--but imposes personal and collective costs. Wouldn't it be a missed opportunity not to do something player-facing with that trade-off?
I think a lot of it only works because it’s D&D. Like, you could certainly do a setting just like Dark Sun with another system and it could be good; great, even. But a lot of the choices are pointed subversions of D&D conventions, and I think they would lose some of that impact if it wasn’t D&D.
Yeah, the first thing that system's designers would do is slap a new name on the elves and halflings to get the vanilla high fantasy flavor out of their rocky road planetary romance.
I kinda feel Athas tried to be "Conan visits Barsoom as written by Vance", but somehow misses the mark on all takes. I'm not exactly sure why.
The mirth is not gigantic enough for Conan to bother visiting, the anachronistic southern honor is not performative enough to replicate Barsoom, and the flamboyant scoundrels are not flighty enough to have been written by Vance
