Most important is understanding the virus in the community - getting people tested (which they don't have to do), and spotting trends (positive person lives in "X" community, we get data on how many people also test positive in the same place) is more important than knowing whether you were in close contact with your friend Betty or where you were at 13:37 5 days ago.
It's hilarious Google/Apple thought "hmm yes, Bluetooth! The perfect protocol to help prevent the spread of a pandemic", and it has spectacularly, and utterly failed. Their APIs are an embarrassment and should've been removed a long time ago. Their arrogance in thinking that crappy protocol can have any part to play in human health/wellbeing is just mind mindbogglingly idiotic.
Apps will not help a pandemic, apart from in the US where they masturbate over your data and want to know your location every second, who your contacts are, who you talk to, what messages you send them, how they can profile/target you better for ads, and how they can feed "big data" machines to later fuck you/others over with more measured/accurate data or AI systems (like clearview) for law enforcement. Hence the whole no US-wide "GDPR" thing because they really want your data.
If your testing capability is low, and if people are not being tested, then everything else is a waste of time. Then you add in societal failures like not getting sick pay, or paid time off if you've got the virus, or incentives to work regardless and you realize 'contact tracing' is just another data gathering excuse.
Because we don't 'contact trace' the flu, or other sicknesses, we accept them as they happen and are a part of life. As the Coronavirus dies down, it'll be in the same bucket, where people just have it, get over it, and that's all there is to it.
Contact tracing has failed in any substantial form, as the recent outbreaks across the world have demonstrated.