The tests can tell you if you have covid-19. What they can't do, because they have such a high false negative rate, is tell you that you don't have it.
But if you catch co19 t-0 after leaving the testing site then you can spread it, right?
So what is testing the world going to solve if no one is preventing the spread of contamination? Because the answer is that you will only overwhelm hospital resources
I don’t think anyone is proposing that testing is a magical cure for the overall problem; obviously you’d have to use testing in conjunction with treatment and isolation and presumably other tactics.
However, this idea that testing is worthless is frankly bizarre. You can’t control what you can’t measure, and “number of people occupying hospital beds” is a very poor measure for a disease that spreads silently for weeks before symptoms emerge.