XEL - the question is, in which parts does the action take place on Enroth and in which on Xeen. Regarding the recovery after the cataclysm, this is quite possible: nowhere is it said that the explosion engulfed the entire planet; remote lands could have survived, there are fewer cataclysms in dungeons, some races may have gone into portals and then returned. Regarding the recovery - the cataclysm is magical, which means its consequences are unknown, how it will develop, and besides, there are gods, the Guardian. All this justifies the relatively rapid new development of the continents.
The elves should have a recognizable druid character.
By the way, which name is better, Aquilon or Land of Eternal Forests?
Added after 14 minutes
XEL - the question is, in which parts does the action take place on Enroth and in which on Xeen.