It doesn't seem like there is a very big difference between the 2* gear and the 3* gear. Are the bars on the stats panel just misleading or is there really not that much of a difference? And then once it reaches 4* level, the stats just explode.
And another thing I'm curious about. Why would anybody ever use the Volcanic Plate shield over the Ironmight Plate Shield? They have the same Normal defense and Heath, but then the Ironmight has almost a full bar of Piercing on top of it. Is this another case of misleading bars?
As far as Volcanic Plate, and Ironmight you're trading that pierce resist off for Fire Resist. Fire is everywhere in this game. You wont face much piercing outside of Jelly Palace. Even then, there isn't much need for pierce defense. I can go into JP in full Vog, and a non pierce defense shield, and still solo JK along with every other floor.