I'm a designer, and a "user" of software, and I use several terminal commands on a regular basis. I don't consider myself anything approaching a "developer," but I code a little in Ruby, Javascript, etc. It's semantics, sure, but when you draw hard lines around what people are and what they "need," you potentially limit a lot of blurrier, less-stereotypical scenarios. And how is a designer (or a child, or a business-person, or a manager, or whoever) supposed to cross that mystical threshold into beginner developer if the tools are behind a financial or obfuscatory barrier?

I think that's the main argument. Getting started with command-line tools and developer-type stuff should be as easy as possible, so that people can try new things and break stereotypes and do more than they thought they could do.