You forget this is HN, where software engineers will go off on tangent talking about how "they could have designed the airplane rotor to not crash" or something equally ridiculous. Everyone here is an expert at everything, because they wrote a blog once, or since Paul Graham is perceived to be an expert on everything, they can be too.
As you know, Bob, they let anybody on here regardless of occupation or knowledge of Phil Graham. So some random commenter could perfectly well be an aerospace engineer. Or someone that's never been employed in their whole life.