I guess it is not a complete spoiler if I warn the antagonist in the Dragonlance novel "Flint, king of Gullys" is a wizard dwarf. And it was still 2nd Ed.
The change and evolution is not bad, but we need it was in the right path. The reboot of "my little pony" has got a radically different style, but we know it has been more popular than the original generation 1 from the 80s.
The styles of the James Bond movies are radically different if we compare Sean Conery's and Daniel Craig's ages. Flash Gordon is a good example of differents styles throught the decades, or Buck Rogers.
If I was the order of the cronomancers ( = the D&D timecop) I would choose the Athasian Tablelands as battlefield against other faction of crononauts/time travelers because there the risk of collateral damages is relatively lower. (I mean we could find a reason to explain the possible reboot of Dark Sun).
Birthright in 5e had to be rebooted radically, among other reasons to erasure the limits about classes and species. My own suggestion is after Vecna event the wildspace of Cerilia was "rewritten", and this also caused a curious secondary effect. A lot of souls reincarnated into other world, closer to the Victorian age, where the historical events of the world of Aebrynis were only speculative fiction from fantasy novels. But later those souls from this second world are reincarnated again to the rewritten world of Aebrynis, remember the stories from those books. They believe they are within a fictional work but really they have traveled to the past.
The gullys from Dragonlance are an example of how changes can't be avoided. They were created for comical intentions, but today that type of humor is not wellcome for the current standards, and then or they are "cancelled" and erasured, or retconected softing their flaws.
Maybe Vecna was partially responsible of the Cataclysm of Krynn. By means of sleeping agents he tricked the king-priest to rebel against the Krynn pantheon. In the day of the Cataclsym the king-priest used a spell to summon Vecna, unknown he was opening the door to the Devil. That summoning spell created a planar rift, but accidentally this caused the fall of a meteor from the heaven, a fragment of Zivilyn when this was destroyed by fault of the local rebellion against the deities.
* If something I have learnt with Ravenloft is a D&D setting works better if it allows more space to add homemade ideas from the rest of players. And here old settings suffer a serious handicap, specially Dark Sun.
My suggestion is after the Vecna Event the Athasian Tablelands is a demiplane isolated as a quarantine zone. And latter other domains are added, with their own troubles, like a alien werevernim apocalypse, for example., or a failed experiment from the Gamma World.
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