So there will be no record of how many double vaccinated people catch covid and how this effects them?
This is how flu has been traced here - if you're not sick enough to need treatment, it's untracked, I don't think this is revolutionary, or particularly a negative. You still discover the cases that make people ill, and they are the ones that matter, and you save the cost and trouble of trying to identify every case - which isn't going to happen anyway as too many people have no symptoms, or too few symptoms for their own desire to test.
It's also simpler advice and likely advice that some people would follow when they wouldn't follow test advice, as being forced to stay home is still worse than choosing to stay home but walking around the streets early in the morning when few others are around.