I think that when the mod updates to 1.17, the mod Copper should be removed and all their mod features should be given to the vanilla Copper in order to make the vanilla version more interesting. This is also one of the few instances of a vanilla variant being more interesting than a mod variant. The only thing Copper can do in the mod is being combined with Tin to make bronze. Vanilla Copper can be used in lightning rods, spyglasses, and other things. It may not be that much, but it is more than the mod variant.