Teorically the kenders should extinct because they are too daredevil and imprudent to survive serial killers and other supernatural predators from horror movies but some females kenders who needed money started to work as gravure idols (only legal SFW pictures) and then... they became too popular among certain groups within otaku community. (yes, they may be very sick, I want to say nothing about the Welchselkind because it makes me nauseous)
What if there are dragon-gods within the sun and the moons? Maybe the cults of the moons Gal and Guthay are allowed in Draj by Tectuktitlay because officialy these are the parents of the sorcerer-king. Secretly among the leaders of these cults there are infiltrated moon dragonborns.
Other theory is in the First War when nature-masters fought against the nature-benders some populations were evacuated, at least some nature-benders who didn't want to be "hunted" by the nature-masters.
My new crazy idea is to add a new transitive realm, the "invisible domains", practically the Athasian version of the plane of the mirrors. Mirrors with the size of a door aren't easy to be found in Athas but in palace or richest one's homes but the mirages are possible in the desert. These could be zones of the Feywild that were conquered or tainted by some outsider power causing a planar shatering. The invisible domains weren't affected so much by the defiler magic. Some "mirage lands" within the invisible domains could show moments from the past or the future of Athas, but also possible alternate timelines. This could be good or bad. For example an Athas in the blue age where the nature-benders won the First War but the Athaspace was invaded by the illithids, and this caused the creation of the "zerns". In other timeline the gnomes and faeries could survive the cleasing war, or a technologically advanced solarpunk Athas thanks the arrival of the reptilian alien T'sa .
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Zern from MM IV
Maybe those invisible domains were created intentionally to be the ultimate hideout.
And within the "Land-within-the-Wind" (Athasian Feywild) there are "domains of delight" but these are very bittersweet, like keeping your favorite toys from your childhood gifted by your dead grandparents. So much nostalgia that it hurts. Here the native could be very xenophobic and we shouldn't blame them too much.
* Other idea is the end the Athaspace happened... several times... and time after time because it is an infernal plane in a time loop. Here the irony is the population could be evacuated but they don't want to do because they don't trust who offer help. They suspect it may be a trick to be catched as slaves. But here lots of slaves dare to take the risk because if it is a trap the new owners maybe aren't worse than the previous.