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People w/symptoms are already staying home, remember. The added utility of testing them is very unclear But you need every last positive result you can get, so you test them mainly, and you test at high Ct thresholds to catch as many old no-longer-relevant infections as possible
Also, supposedly mass testing is for enabling contact tracers to track down all the disease bearers. Why, then, would you want to flood their docket with a lot of old recovered cases? Because positive cases are politically useful, and contact tracing is bullshit.
