The Dungeon Journal, truly the most absolute of sources, especially when the word "destroyed" is used with no adjectives.
Let's also not forget exactly how Outland was destroyed, as well. Surely, consistency with something as absolute as the Dungeon Journal is worth sacrificing one of the most interesting possible new locales for us to explore that already exists in lore.
Oh, also, if we're taking single statements from irrelevant sources as absolute, here's an Ethereal
heavily implying that K'Aresh or the remnants thereof at least still has Ethereal inhabitants.
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Yes, the world-destroying power that a few Elves of dubious quality could evidently harness unrestricted. Truly, if even a people as innately destructive and irresponsible as Warcraft Elves can possess the discipline to regulate this power effectively, then we can't possibly imagine that there's anything left of K'Aresh.
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Absolutely agreed. K'Aresh has the potential for several kind of environments we haven't seen yet in Warcraft—I actually drafted an unpublished concept for a K'Aresh expansion, and people far
more creative than I am have had a bit of fun with this one (though the former was admittedly more akin to what Varodoc suggested on a lesser scale, since K'Aresh was only part of a growing accumulation of a dreg heap of Void-eaten rocks, but GoldenYak really made something very fun out of the various exotic locales there)
Disregarding my curt statements to my other interlocutor, one idea I always had that would be a fun way of reconciling the threat the Void is meant to represent with having an expansion on K'Aresh would be for the entire thing to be in some kind of massive Eco-Dome (though it would be transparent near the top, of course, so that the sky with the typical Void aesthetics would be visible, with a massive sea of splotchy liquid Void outside of it. It would simultaneously make K'Aresh feel like it would've been even more impressive when it was still in its prime while also establishing exactly how much the Void destroyed the planet. It would also allow for Blizzard to avoid making another "rocks floating in space" expansion and giving Void-eaten planet remnants something of a distinct identity and aesthetic from Outland.
A couple zones I think would be very nice would be a Turkish-style steppe zone that blends into the last lush jungle left on K'Aresh, a massive desert with silver sand innately imbued with Arcane magic by the Ethereals, something like a much worse version of Deadwind Pass that used to be an experimentation ground where the Ethereals exploited more primitive races for soul-trading, a proper "Locus" zone that's exactly as Void-damaged as something can be before it become totally uninhabitable on a physical and spiritual level for mortal races, and the ruins of a massive city that used to be the technological epicenter of K'Aresh.
The thing that really interests me about a K'Aresh expansion is the opportunity for a nice and proper adventure. Plundering tombs and destroyed cities with Ethereal "archaeologists", exploring the side-effects of the Ethereal's greed combined with their advanced technology leading to the exploitation of more primitive races, exploring the culture and society of this race, re-establishing their society on their planet etc. It would be alien, but I don't think that would be a problem if it legitimately felt like a world you wanted to explore instead of a boring theme park of one-note aesthetics like Shadowlands.
Eh, I'm really not a fan of villain batting everybody who's a little harsh on the Alliance side. I've been hoping that Turalyon helps to take the Alliance in a more assertive, albeit not actively warmongering, direction.