This was the method I was thought when I took my EMR course (and every first aid class except OFA3 actually):
I feel that automatically inflating the cuff to 200mmHg is too harsh on frail elderly and underdeveloped child's arms (hell, it's too much for me too). We are learning the 2 step method in RN school right now and I find it is redundant to the above mentioned "EMR" method which also ensures you won't be fooled by the ausc gap. This "EMR" method is the method I have seen most often.
So why the switch to the 2-step method over the "EMR" method? There must be some benefit.