Though the people you Contact Trace (onto) aren't people yet told to quarantine themselves, so that's not doing anything.
When I went to the barber and left my name and mobile, if anybody had made that listed information necessary to use then they could probably use one of the CTs to try (and likely succeed, even if I'd be wary of an unknown number) to contact me, tell me the 'worst', get me to bunker down except for a trip to a local testing site...
Now they have fewer people doing that (never mind that they were terrible at setting it up, such that at first it seemed half the CTs had no work to do, by now they ought to have or the system is even more broke), less people in a position to phone me, nobody knows my address until they phone me (or tap into my mobile company's DB, but this is a long-held PAYG that I probably bought - if with any address at all - when I was elsewhere, so good luck with that), and even if they were completely able to send someone out to wherever I happened to be, the latency between mine and prior/later doors-knocked is much higher due to travel (unless my street is due to be hit with a mass-alert on the same day,vwhich is unlikely).
So I still question the sanity of a system that seems still not to be working at full necessary potential now being downsized and throttled.
Later on, listening to a repeat of the item, it seemed they were looking for "local knowledge". But the importance of that doesn't seem to match the needs of a nationwide "whackamole", and sounds like they're just telling local authorities to do things now, to get the whole process off the books of the Treasury and plausibly abdicate responsibility for any failures that then occur.
(Plus, while I'm here: it is a "moral responsibility" to get children back into schools? That absolutism implies that al those who are cautious about doing so are immoral. I have no problem looking toward trying to make return to school a plausible situation, but all the language has been "it will be done, and we will brook no arguments about it". Which is decisiveness too far.)