Originally posted by knighttemplar1960:

Why? IRL bronze was too valuable to make a such a large sword. That's why the Romans used the bronze spears and a gladius. Iron was plentiful and cheap that's why 2 handed swords started appearing in the late iron age.

The 2 handed bronze weapon in the game is the thematically appropriate bronze aetgir.

That makes sense, in a world where money mattered and copper/tin/bronze was not the safest and most accessible of the metals. OP was talking about Valheim unless I am mistaken.