Except for the part where we didn't. Jaina's own quest text in that ToT quest says she was acting on a rumor. That rumor was explicitly false and we've known it to be false for ages. We've also seen Wrathion being the one to actually get something from Thunder King in that exact same patch. Meanwhile Sylvanas got power from a soul engine that also serves as a power source to something akin to a god. And she used it to get more varied magical arrows, which she used prior to it as well, as well as dark death-related magic which she also used previously as well. Congrats, yet again every single thing you said here is wrong.