Idk what their reasoning is for most things, but I kinda see this one getting nerfed. The rewards aren't worth the difficulty and the difficulty isn't worth the attempt to most players. Why get irritated in criterion when there are so many other more rewarding high end things to tackle?

Might also just be that it is tuned kinda high for the current gearset and will be significantly easier by 6.5, though. In either case, as fewer people are even attempting it going forward, it will either be brought in line or forgotten like diadem, that's their call. o.o;