Very impressive, but all extract???
Isn't there a point in your brewing career that you want to make that last big step?
If he's happy doing what he's doing, why should he change?
Yes that's a good point, but there's another way to look at it. I could have stopped at a high school education, but I went further. I could have continued making wood projects with a circular saw, but I went further and got a radial saw, planer, etc. In all cases, I bettered myself by taking that next step.
I've seen many times where people say they're happy making beer with their unaltered tap water or fermenting at room temperature, yet many, yourself included, post back and tell them to make changes. How is my comment any different?