I love this. Yup, it's something I've completely left out, but that was (partially) intentional. I wish I did a better job explaining this, but yes - the technique I talk about won't let you master anything, but will let you scratch the surface on a lot of things really fast. There are things I want to master, but there are too many things out there that fit that bill for me and I still haven't found something I'm able to spend the amount of time you've put into 3D modeling without getting distracted.

I hope to write a follow up post to this when my own thoughts on this topic are more clear.