Agree with "herd immunity strategy by default". Absent a vaccine, about the same percentage of people will become sick, while a larger percentage is exposed but

Agree with "herd immunity strategy by default". Absent a vaccine, about the same percentage of people will become sick, while a larger percentage is exposed but does not become sick. At some point, again minus a vaccine, few enough people will be left as potential replicating hosts, that the virus will not be replicating fast enough to maintain the country's epidemic. Countries will differ by the breadth of the curve, but not the area under it (adjusted per-capita of course). On the other hand, if you are one of the countries with a long curve, and an effective vaccine arrives before the end of it, you benefit.