I'm not being argumentative - I was simply a huge fan of RQ2 and a long-time player of all things Glorantha. In RQ2, iron was a rune metal for cults that could work it, rare and very dangerous. But no more rare and dangerous than lead weapons, or gold weapons, or wooden weapons.
Bronze was the default. The properties of other weapons and armour weren't envisaged as a function of metallurgy, but of religious and cultural blessing.
Nor am I! It caught me a bit off guard is all. I'm trying to imagine a bronze 2-handed sword being used for a 3rd strike. Either we glossed over the whole "it was made of bronze" or I let that detail go in the last 30+ years. I remember rune metal (vaguely).