Are WF/BF automatically proficient with the armor they get when they take one of the Armor Plating feats?
Example: I want to play a Bladeforged Barbarian. Barbarians are proficient with Light and Medium armors. If I take Adamantine Plating (Heavy Armor), will I be proficient in it or will I not be proficient and assessed some sort of penalty like -4 to Hit or something similar?