I edited the article to explain what I meant a little better, and sound a little less grandiose. (I'm not entirely sure it's better this way - I have the old article saved, anyone who read both articles, let me know what you think of the difference). I think I may have implied a particular kind of "relevance" that I didn't intend to. Let me know if you still disagree. Also let me know if the disagreement stems from me misusing the word rationality, or from you disbelieving that drawing will have the effect that I say it will.

I think it's very easy to learn to draw without having the skills generalize, but I do think certain skills can generalize if you approach them in a certain way. (I'm trying to work out a testable prediction that would settle this, but I don't think we have very good tests that measure the relevant things in the first place)