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That's actually a handy shortcut that could potentially be of practical use to lots of people.
It can be gamed however.
Point number 1 assumes you have trustworthy institutions that are not captured by political/financial interests in the way the FDA/CDC have since proved to be.
It assumes easy access to trustworthy, accurate and timely data. Many countries fail these criteria.
Point 2 assumes the same, i.e. that medical professionals have not been compromised.
