Why would we not want a game set in the Hyborian Age look like how the Hyborian Age was described by its original creator?
The Howardian lore is based on a cycle where great civilizations rise and fall. Just like the earlier Thurian Age had its great empires, so does the Hyborian Age. Both collapsed into near-nothingness due to natural disasters etc., so what we “know” about our real-world pre-Ice Age technology and culture has no relevance to how the cultures in the fictional Hyborian Age developed.
That said, mail armor featured prominently in Howard’s Conan stories, and was often favored by Conan himself, so naturally I’d love to see more variations of it in the game. But maybe it’s just a pain in the butt to model, compared to leathers or plate.