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> It's not at all clear yet that recovering from COVID-19 confers any lasting immunity.

Coronaviruses aren't new...

Not sure how that's relevant. Coronaviruses behave differently from each other, and it's not clear how this one behaves wrt post-recovery immunity.

And to your point, many forms of the "common cold" are caused by coronaviruses, and it's not like herd immunity is a thing there.

Short to medium term immunity is conferred to survivors of other coronaviruses. No reason to expect it won't be the same with this one.