No room for growth in Boss progression.

Blizzard has left themselves no room for growth when it comes to shas in future tiers. Right from launch we had shas or anger, doubt and a whole smorgasbord of other powerful emotions. What exactly are the shas 2 or 3 tiers from now going to be?

I propose that Blizz hotfixes in name changes for the present shas. The sha of anger could instead be the sha of mild irritation, the sha of doubt instead the sha of slight uncertainty etc. In future tiers, the shas could be of progressively more extreme emotions, leading to a natural progression of shas.