Also the confirmation that Vashj WAS originally turned back into a Night Elf upon arriving in the Shadowlands but chose to become a Naga again in Maldraxxus. Super interesting. That was something I was super curious about. So even the Old God corruption is undone there.
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Vashj was a Night Elf so it makes sense she reverts to her original form when going into the afterlife, and Maldraxxus (more than any other, even Bastion) is all about changing/perfecting/honing your form, so it makes sense she could become a Naga again. I donno about Aqir tho
I think it'd be nice for the races that evolved. Nerubians for instance rejected the Old Gods as time went on. Meaning they gained their own form of sentience and identity.