The assumptions of benefit appear to rely on a naive theory of instantaneous contact and isolation, when in practice the entire process is unavoidably manual, requiring human intelligence to ascertain environmental factors with which to make a determination about whether someone is a close contact.

When you consider that close contacts include anyone you've spent more than 2 hours with in a room, it becomes clear that most life situations are not handled by estimates of proximity using bluetooth: home, family & friend visits, workplaces.

You can find a deep-dive into these issues here:

https://blog.crushthecurve.today/why-should-you-install-the-...