This is at the crux of this whole discussion and it seems apparent that there is not going to be a consensus as to which is right. Yourself and some others clearly don't believe that calling "new advantage" simultaneously conveys the message that the previous advantage is over, whereas the likes of Pegleg, Phil E and myself do believe that to be the case.
I am starting to wonder if my position (as stated above) is correct.
I think it is...., think of this.
Penalty advantage being played.
Then scrum advantage being played (new advantage, but the original penalty advantage is still live).
Then we progress to the point that the scrum advantage is over, but the first penalty advantage is still alive.
Then there might be another penalty advantage.
(This may be an unlikely event, but I am trying to illustrate a point)
Convention and assessors require us to announce loudly when advantage is over.
Are we now in a position where I have to say "scrum advantage over, but penalty advantage still alive"; or "second advantage over, first and third advantage still alive". We obviously can't do what we normally do which is to shout "advantage over" as that would lead everyone to think all the advantages are over. And shouting "advantage over, still advantage" makes no sense.
This is why "New Advantage" would signify the old advantage is over (I am sure that what the players think it means); or are we saying you can never have more than one advantage alive at the same time?