That seems like a bad analogy, given that this web site is explicitly aims to teach a method. It doesn't explain the "why" of anything, except in broad strokes

That seems like a bad analogy, given that this web site is explicitly aims to teach a method. It doesn't explain the "why" of anything, except in broad strokes (a big fat heading is more punchy and so on), it only prescribes a specific, extremely narrow set of choices. Methods are based on principles. If nothing rigorous underpins the choices we make in design, how can it be taught?