What is clarifying about this metric is it makes clear that a certain number of cases are NEEDED to get through this. We can and should debate the extent of preventive measures, but if 100% of the population is quarantined with no symptoms, then we are merely delaying the inevitable.
Basically what we need is a controlled flow of water–of new infection–and we are using coerced labor stoppages (quarantines, shelter in place orders)–as a sluice gate. Policy makers need to look specifically at respirator use around the country, and at identified new infections. We need a certain amount of both. If we don’t get enough, then quarantines need to be relaxed. Let people under 60 out, or businesses starting A-L to reopen. Some method to generate some circulation.
Stopping the water–new infections–will never be a valid long term solution. If there is intelligence in any of this, it is choosing measures proportionate to the diseases, the diseases of COVID-19, and economic ruin. The two need to be balanced.