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"/////Yes, but at least with a false negative you don't lose anything/////
Correct, except to go ahead and freely transmit the disease. "
But as we know, with this virus, people with no symptoms spread it. That is probably the main cause of the spread being so hard to deal with. And it's one reason of many why the test and trace system was next to useless.
If someone is tested and is neagive, but actually does have the virus, then that is obviously bad, but it doesn't seem worth worryng about. Juat make the test better, if you can, but we can only do what we can do. These lateral flow tests are even less accurate.
PCR tests, in fact, seem to be pretty good.