(Author here again) I appreciate your point here! It's true that "wizard" reminds me a little bit of being called a "rockstar," which I have always had a distaste for due to the above-mentioned ego thing. I elected to use "wizard" because I find it to be a useful and interesting metaphor in light of my own personal love for RPGs and fantasy, and because I was really inspired by Julia Evans' use of the term to de-mystify learning. I think of it as a rhetorical device, and nothing more.