No one knows why the CDC issued the guidelines that they did. There's also fairly little doubt that the CDC in previous decades would've been smarter and better

No one knows why the CDC issued the guidelines that they did. There's also fairly little doubt that the CDC in previous decades would've been smarter and better organized. A lot of the commentary about the matter is disingenuous. Of course they won't filter out all the infectious agents for all healthcare workers forever. It was a matter of risk mitigation, just as much as shelter-in-place is. Getting infected is a numbers game, as is the live-locking of available hospital capacity.