Well when we have three guys in the flight deck the two FO's do the numbers, and when we have a runway change the FO does the numbers and when the jet get stopped the CAPT will look at the numbers. I do not necessary see it as a "stupid procedure." It may get tweaked, but doing this after push is not going to be that big of a difference. It may require some trust in the FO's but not much more than that.