I’m not talking about Sweden, or the US, or Italy or the UK or France, But NZ, Vietnam, China and Australia (current flare up not withstanding) have pursued policies of lockdowns, contract tracing and heavy testing. Your proposal is more convoluted and relies on the imperfect information we have regarding susceptibilities (genetic susceptibilities) being correct, and being able to scale tests to a couple billion people almost immediately so we can tell who should stay inside.