Every expansion it's the same "oh no theres an outside threat we have to team up against", lets band together in groups based on faction to take down the threat.
It's really gotten old at this point. There was one zone in Legion that focused on the Horde/Alliance faction war. And it lasted a total of 20 quests, the rest of the expansion is Alliance and Horde helping Alliance and Horde. (Well my Horde guy was mostly helping Alliance, I don't know how the other faction goes)
Why can't Alliance and Horde queue together for dungeons or Raids? Why can't we talk to each other even though the Lore characters can hurl insults at each other?
I understand the faction split for PVP zones/instances. But outside of that, the actual warfare between Alliance and Horde is non-existent.