why does mistlands grade armour use regular iron and not black metal?

I'm so sick of everything using iron in this game, it makes me feel like black metal is useless despite it being acquired 2 biomes after iron. You need iron for better buildings, armour, weapons, and crafting stations whilst black metal is only used for a few crafting stations, weapons, and tools. I hate the swamp and personally think its the least enjoyable biome in the game so being forced to spend a lot of time there in dungeons just mining for metal sucks. Are there any mods that swap padded and carapace gear from iron to black metal?