Earlier quoted context omitted.
Okay, so if the binary thinking is wrong, why stop at three? Why stop at all? Does the science say we just blast our bodies with as much mRNA as we can get away with?
Elementary economic thinking answers this question. Benefits asymptote, so you'll stop at the point where the marginal benefit of an additional shot is less than the marginal financial cost, marginal opportunity cost and marginal cost of side effects all combined. That's definitely not the case before two and may not be the case before three based on data we've seen. It might be the case before four. And this doesn't…
But this is already the case for young people and people who already had covid and recovered, but we don't see them excluded from vaccinations based on their risk profile. So I think there is no reason to think that this logic will be applied more truthfully at some arbitrary time in future.