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Plus at higher difficulties running mines can really drown you in Cataclysm points, and the advanced Tool buildings ensure you use less ore overall and therefore spend less time running the mines.
But yeah, I typically don't research and build these ones. They might need a little revisit.
You also sometimes want fairly large amounts of metal ingots for producing nature from temples, but iron doesn't really help with that, since it gives you fewer ingots per smelting action than copper does. (This is more relevant on higher difficulties since you'll need to produce a lot more nature points.)