They mostly prove that as she lucid dreams her strength is such that the dreams become reality. Very Hindu.
What I find more worrisome is that the Titan constructs are built simply to keep her in sleep and the nightmares suppressed rather than somehow working with her to deal with the fear.
Which actually brings up an interesting point, how much of the old god corruption is truly down to them and how much of it is actually Azeroth expressing herself through lucid dreaming?