Some people, grocery store workers and emergency workers are expected to be working. If you could test such workers as they show up at work, these work places would be much safer.

The "shelter in place" order is pretty as leaky as a sieve to be honest - people are still buying groceries at crowded stores because they don't have a choice. So yeah, if you could really confine everyone for three weeks, the problem would go away quicker but now, when that's not really what's happening, tests as a tool seem useful.

From what I understand it’s the asymptomatic cases that are the problem, and they’re not getting tested anyway.

When you have a ten minute test, why not test asymptomatic people?

Plus also, we need to be working hard now so we have testing, contract tracing and quarantine method available later, when they are need to "mop up" the remaining cases.