Well, they did … because none of those groups were destroyed. Regardless, the issue then always comes down to what sort of restitutions do the Alliance players expect; that also wont sterilize the Horde faction for future stories. Truly, what is the price here? Our characters? What characters do we even have left at this point? Our territories? What territories, a handful of deserts so destitute the people there are subject to repeated famines? Our cities? I mean … sure? I guess? Go ahead?
The Horde Faction is so fundamentally broken and battered at this point that there is nothing else we can give up that we haven’t already; beyond simply becoming an accessory faction to the Alliance. Blizz may have left us functionally in the game, but with their horrific track record the last decade of fixing what they broke with us … they might have well just told us we’ll never be heroes or relevant again. Because they “love writing the Horde so much” they’ll continue never having time to rebuild us until they need another weak, ineffectual villain to break down.