Food for thought. Would WoW function better if there was an extremely high difficulty mode for content that once cleared instantly rewarded all of that modes progression?
For example say you beat wizard mode torghast. You unlock all leggo patterns and soul ash is instantly fulfilled for all future crafting. Lets say you get all your keystones done at level 20 suddenly all your conduits are filled.
That was the high end player base isn't dragged into other people's progression systems and muck them all up for both parties, while by the same token wizard mode would be hard enough only a small fraction of the playerbase could do it keeping that progression relevant for others.