While you rightly criticize [MENTION=6966901]Mike R[/MENTION] for being unable to put down a particular philosophical lens when evaluating a fictional fantasy game, I have to muddy the waters a bit. The naturalism he is espousing has a very long pedigree in philosophy, with origins in Classical India and Greece. Both the Epicureans and the Stoics were naturalistic, making naturalism arguably the dominant view among thinkers in the West until Christianity changed the game.
Well, Stocism, at least, does not serve you here. "Virtue consists in a will that is in agreement with Nature," is a basic Stoic tenet. However, this admits that human will can be in *disagreement* with nature.
Similarly, with Epicurians, we have the idea that there are three kinds of desires: the natural and necessary, the natural but not necessary, and those that are neither natural or necessary. This, again, admits to humans having unnatural desires - there is something about humans that is not natural.
So, I say both of these early philosophies fall rather short of the idea that anything that humans do is natural, by definition. Rather, both accept that humans have issues when they step away from their natures - though they have *major* disagreements about what those natures are
In general, once we've hit the Christian era, we have the three major religions of Europe and the Middle East all claiming that humans, as created by the divine, have a special place in the universe, outside of the natural order. And, since the highest accomplishment of these cultures was iron, that iron becomes symbolic of mankind's special status. The Western World doesn't make major steps away from that until after Darwin, IMHO.
Yes, "cold iron" plays a prominent role in European folklore warding off fairies. But a nature-vs.-technology conflict does not satisfactorily explain why. Remember, too, that iron also supposedly wards off evil spirits, witches, bad luck, and so on.
Iron is seen as anti-magic at least as far back as Pliny the Elder, in the First Century, AD. We may note that it is during Pliny's life that the Romans come to the British Isles - bringing with them wealth and relatively advanced technology. The idea that iron and human works are inimical to the fae powers probably has a lot to do with Roman occupation of Britain. Romans were all about taming the lands around them - roads, aqueducts, and so on....