Damn, I totally forgot about that.
Horde: side with Horde leaders and start a revolution. Take over a town after awesome march.
Alliance: use a robot cat to spy on the enemy, ally with the Horde.
And in PTR, Vol'jin basically bullied the Alliance into submission, despite the Alliance having the upper hand. Only after feedback Blizzard added a proper Alliance response.
Damn you for making me remember that fiasco.
And then Blizzard did its magic and retroactively turned two entire Legion zones into Horde content throught allied races, while giving the Alliance two races that were essentially asspulls no one asked for.
I don't mind Horde getting nice things. I do take issue with Alliance getting the short end of the stick out of the deal.