So Malfurion and Tyrande are leaders of a people that overthrew the ruling class of their empire in a violent chaotic upheaval that shattered the world, and then proceeded to radically reformulate their society along different principles. That’s a fact of the lore. Unfortunately, this fact is stripped of all revolutionary content because the story is centered entirely around Foreigner Corrupter Demons and Good People vs Evil People, rather than struggle between classes erupting into open warfare for control over society.
Like, instead of Highborn being turned against because of their oppression of their own people growing to outrageous proportions, they simply become bad because they are corrupted by Foreigners. Tyrande and Malfurion are not emphasized as leaders taking the reigns of a spontaneous uprising by oppressed masses to gain political power and reshape society, but simple disillusioned Good Guys taking on the Bad Corrupted Guys. The arts of the Highborn are not said to be outlawed post-sundering because they represent the very mechanisms by which the disposed ruling class maintained power and therefor fundamentally hostile to the new regime, but because they might attract foreigner demons.
I find that all pretty sad and boring when taken at face value.
But hey, that’s WoW!