[folletto]

Again, I agree. The whole article isn't built on that dichotomy. It's just a sequence from a simple perspective to a more complex perspective, and actually ends saying that it's better if you are willing to expand your view, exactly like you are saying. :)

~

On the second part of your comment, well, you are talking about "web designer" specifically, and with a very specific definition of it as well. If that's your definition, then yes, he have to do that. But er, it looks more like a Frontend Developer to me, and I never heard of a "Concept Artist". ;) However, it's a matter of terminology here, and there's surely some confusion about it. :)