Last time I flew in the USA - an island airport about 2 years ago, I gave POB at taxi, as I'm used to in the UK, and got ticked off for it by the instructor who was there for my BFR. I explained why it was normal in the UK, he offered that in the USA, they expected their emergency services to work out how many to rescue for themselves!
It's a view, on the whole, I prefer the British method.
G