Personally, I don't think the biome weapons were intended to be representative, but instead, diverse. That way ever chest would have something super useful in a single situation, but not every one. It shouldn't specifically be that every class is represented, but instead, every situation you find yourself in. Of course, the usually does track back to classes, but not entirely. There is a small amount of flexibility on the matter, if the un-balancing weapon functioned with some unique mechanic, Like the difference between a sword witch is swung, and a flail witch is thrown. They are both melee, yet completely different.