I used to love the concept of primitive technology and I watched eagerly to see how far he'd get. The fact that he's been more or less stuck for a few years with iron, kinda proves to me that more than purely a technical advance (which is also the case), the whole development of technology is more of a societal thing than an individual stroke of genius as we paint it today. We name discoveries by the people who had the idea, not by the society that nurtured, educated and gave them the resources and time to come up with it. Without the development of city-states and the influence of a vast network of international trade, the bronze are wouldn't have developed as strongly as it did and into an iron age