Literally. Why is it SO hard for Blizzard (and other modern game devs for that matter) to just DO THE COOL THINGS instead of wasting braincells on plots no one cares about.
They could have done literally anything with the Old God Blood up to and including making Nightmare Visions of C’thun, Yogg’saron, N’zoth and Y’sarj and it would have earned 1000000000x investment from players no matter how much of an ***pull it would be and no one would care that it was