So, I've asked quite a few times in the past for steel to be spread down a couple levels to create a proper iron age. And it happened this world! But this didn't pan out in a way I was hoping for a couple reasons.
A) As has been talked about a lot, coins being pushed to week 5 slowed down making shops/markets since they normally start appearing 3-4 weeks into the game. The suggested solution was to simply push coinpress to hardmetal and/or cast iron so it comes online more in sync with when players are ready to use it development wise.
B) More critical to the concept of an "iron age", iron ore in levels 3-4 is frankly just extremely rare. Because iron was so rare, getting enough iron (and high quality iron so it's competitive with bronze) to make wrought iron gear just never happened. By the time more iron starts showing up, we're already on L5 and making steel. Basically, for the wrought iron age to exist L3 needs to be predominantly chalco for copper ores, and L4 needs significant abundance of Iron Ochre. Why not have those layers get boosted ratios of specifically those ores?
Sorry I didn't predict this when making requests, I knew the conditions and should have seen this coming when asking for it.