Care to provide a Charactername, Realm and Zone? To back up your claim.
Not even "Not The Best". Maybe they want the Vanilla zones? TalentTrees with enhanced with actual Choice that matters?
Its not up to you to decide what people want.
You can attach your model to any skeleton you like. You can even add Humans on the Dreanei Animation Mesh. Would look weird but its possible.
There is no reason the new Models wont work on the Old skeletons. You just have less animation detail.
Furthermor adding, the most "Immersion" you seek, and the "authenticity" comes from the people who play it. And if a more beautifull look, that has the EXACT SAME artstyle will break your immersion, than the community and actual gameplay will break it nonetheless, for that I´m very very sure.