I'm not sure if I agree with your assessment of Warcraft, but I'm also not sure if I want to spend the next few pages arguing about it either. Though it may be better if I were to suggest simply removing the non-D&D settings from the compared set so that D&D settings are compared with other D&D settings in regards to their magic.
I added nonD&D settings to display how D&D setting have a major usage of spellcasters with high versatility compared to other fantasy settings.
It's one of the main ways to disprove D&D as generic classic fantasy. D&D characters and monsters have incredible range not found anywhere else in fantasy.
It's something I believe D&D is beyond due exploring. The lowest you really get is Dark Sun and that hasn't made it to 5th yet. And even Dark Sun isn't that narrow