That's what happens when you wrotea perfectly decent old god expansion (so we meet the zandalari trolls and have to deal with their blood old good construct when BAM underwater raid and azshara, who summons nzoth so we have to go to this super epic old god town and fight him!) and then marketing comes along and tells you about how focus groups have shown that the expansion is actually about Sylvanas and a faction war.
So now all the trailers and cinematics and last minute content additions (prepatch event, war campaign, that one asset flipped raid) are about Sylvanas jumping between "for the horde! buy our game!" and "the horde means nothing! buy our next game!" and fan favourites massacaring each other, while your actual expansion somewhere in the backround is about murdering old gods.
Has anyone dealt with that sword from last expansion btw? I feel like we kinda forgot about that plot...seemed important. Hey! Look! Sylvanas is pwning the Lich King!