You all get me wrong, I understand the points you're trying to make, goods have to flow and some industries don't have the leisure to quarantine staff, having said that, testing is only there to prevent the spread, if you don't test 95% of entrants who will by the way not quarantine either how do you effectively control the spread by testing 5% who are quarantined anyways?
If you believe someone testing positive is a threat you have no choice but to isolate that person regardless of their "essentiallity", presidents and prime ministers can quarantine why can't they?