I've always introduced myself, told what style of MA and my form then ask permission to start. We were told asking permission to start gives the judges time to pay attention to you. If they have a problem (ie the score keeper can't add or someone diverts their attention for some reason) they can ask you to not start yet so they can see the whole form. I'll agree that if someone is sitting in the judges seat they shouldn't be bothered but it happens. But yeah I've never understood why you had to announce your school and your instructor. Why don't they just make the intro a little longer by having them announce the date they started their MA, their current rank, when their next test is and their parent's name?
Well hey to each their own, right?