Fun Fact:

Native Americans near Eagle Lake in Wisconsin were some of the earliest metal workers in the world, what is known as the Old Copper Culture. We have copper artifacts from them that are at least 8500 years old.

We have arrowheads, knives, axes, etc, but metal working just... Died out.

The leading theory?

The copper was too pure. Various impurities are what give copper strength, it's quite malleable as a pure metal.

They were doing all this work to make tools not significantly better than flint, so when the easiest sources dried up they just stopped bothering.

The earliest bronze examples are actually made from a copper ore that included arsenic or tin already, and natural ores that include enough of either are quite rare, and they just weren't available to the Old Copper Culture, and without that initial accident of geology they had no way of knowing that adding specific impurities would make the metal stronger, or even a tin mine for it to happen through experimentation.

TL;DR don't be too mean to Ea-Nasir, guy's copper might have just been too pure. Like you've never seen a customer ask for a different product than they actually wanted!