Written in the banshee’s blood means that she is willing to make peace with the Horde when Sylvanas is dead, though.
I don’t really get your point. 8.1 was their revenge patch, and their revenge for the Burning of Teldrassil was indeed condensed into a single quest chain that ended in a stalemate and a Warfront."
It’s obviously not even close to be enough, but as the writers themselves have stated, it’s all the revenge they were going to get, and he specifically didn’t mention anything of the revenge or justice plot going on in Shadowlands, because it won’t.