I think our approach to the virus is misguided because it has no end. Will these restrictions really be in place indefinitely? Is that feasible.
How will we invent a vaccine for this virus in a year or two when we don’t have vaccines for similar viruses. Do you believe in miracles.
Absent a vaccine, the virus will be a problem until the society develops herd immunity. If the gap between infections and testing is large, as it probably is, we may already be pretty far along that path. Also, again assuming that gap, over 40% of the population will have none to mild symptoms. Another 40—45% will have moderate symptoms. These groups do not burden the health system. And when the virus returns in the fall (assuming it is seasonal), they will have some level of immunity.
In the interim we need to focus our efforts on protecting the people who are most vulnerable. You flatten the ICU burden by isolating and supporting the most vulnerable so they are not exposed. We know who they are. It is wrong to suggest that everyone is equally vulnerable.
Restricting whole countries is not feasible. Restrictions may work on an outbreak that is limited geographically. The scale of this outbreak is too big. All the restrictions do is extend the period of infections indefinitely and delay the attainment of herd immunity.