1) Then why the hell are you arguing that the arms are lower when I wasn't even referring to the arms, but the stack height?
2) Explain to me exactly how your chain would grind down on the arms of your u-brakes, without first grinding through the cap. And then find me one person that actually worries about his u-brake arms being ground down by his chain, aside from yourself, because the opinion of morons isn't valid here.