It will still help.
Lets say they have a daughter who works at a grocery store. Getting that daughter out of that store will stop her from spreading it.
Leaving her say stocking shelves will cause massive spread.
Just giving up and saying no point in contact tracing because it is endemic is idiotic.
I takes contact tracing to make isolating and social distancing to be effective.
Ummm... The infected persons daughter doesn't exactly take an extensive questionnaire and lots of hours tracking down people. There might be a good example, but that isn't it.