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I agree with you that relying on state/country cooperation to build the apps was part of the problem. I don’t agree that it’s useless, 15min of close proximity

I agree with you that relying on state/country cooperation to build the apps was part of the problem. I don’t agree that it’s useless, 15min of close proximity to a confirmed positive COVID patient within the timeframe is the best possible determination of exposure and people should quarantine if they get it. I could be persuaded that too many are notified if there’s decent evidence of it, but with the massive case load/spread in the UK right now - I’m more likely to suspect that amount of people exposed is massive.

tomatocracy 6y ago
I'm not sure current case numbers really tell you much either way - you could equally argue that it's evidence that the app didn't work of course. The issue in particular is that Bluetooth proximity isn't reliably able to distinguish between "next to but with a meaningful barrier in between" and "actually next to". In my office, for example, we have areas adjacent to one another separated by floor to ceiling glass walls. People working on one side of the wall don't work with people on the other side and are not allowed to access the other area. There are quite a few scenarios like this (apartment blocks with thin partition walls between apartments, sat in a traffic jam next to another car, etc.