Seems you already have the basic pros and cons. To add here, I have seen a colleague who decided to break the news in advance because of good personal and working relations with the employer, and offer to help in the meantime.
2 karma · joined April 13, 2020
Edit: Previous versions tend to live up to 3 years only. If Google doesn't have initiative to update the service, I guess it has downstream impact to manufacturer to be less motivated to do so.
Understand how to define a close-contact of infected. It requires a constant 30 minutes Bluetooth-strong-signal (geographically near) to the infected person, not just because your "ID" being captured on the infected person.
The app helps find these close-contacts around you and eventually notifying them to isolate themselves and test. Imagine this process chained.
Of course, this will need a scale of people downloading the app. But better-having this auto-logged than human-effort asking infected 1 by 1 (10,000+++ infected VS 100 contact-tracer)!