sglowrider
Thinks the caf is 'wokeish'.
Transmission rates by people without symptoms are now thought to be small, and the other reason for that advice is that there are not enough masks. If the whole population buys them there won't be enough for the healthcare workers who really do need them.
Masks are for secondary level contacts.
You isolate the source and their 1st level contacts. The next level down, secondary contacts, you have them wear masks and manage them with temp readings several times a day.
The other problem is that there is a 14+ days incubation period before any symptoms show up. You could also be sneezing, coughing everywhere without realising that you have the virus -- after all, 83% of carriers will only exhibit mild symptoms. The masks are for unintentional transmissions onto the elderly and the chronics.
This is the self-responsibility that needs to be encouraged; and a component of the communication and education programme that the Gov't needs to do.
The other strategy is to track, map and isolate the sources and their contacts. Develop linkages and then map it out, contact those on the map, and home isolate them. Medic Trace contact teams together with police will be the key drivers.