There was actually an MV where two people were doing the character accepting, after disliking my methods. At one point, a fire manipulator couldn't do more than set a leaf on fire while others were well ahead of that. Three opinions can get hectic. Yes, there are things that are purely restricted, but those also come down to subjectivity.

I disagree with 'two concentrated attacks' on a weapon, because I feel that could be more, but you have to realixe that is referring to an attack specifically on that weapon, not aimed at the arm, and happens to just hit the weapon. Sort of like specifically trying to break an arm.