To me, I wouldn’t recommend NNT even for population decisions, but you could get lucky that the average ARR gives you a correct ‘population decision’ (whatever that means) when compared to the more time-consuming examination of risk distributions. And by the time you’ve done the time-consuming analysis to check, you might as well use it anyway.
Other than quaranteens and closing borders when epidemics occur, I can’t think of many population decisions in medicine.