Having been in the same cell (potentially several square miles) as the murder victim is not quite the same as having been in tracing distance (4m²).
That's quite a strong argument/pretense, why law enforcement would immediately lobby to get the system changed in their favor. Don't you agree?
that information is a lot more sensitive and a lot more useful to law enforcement. most people don't even know how much your location is being tracked.
the contact tracing framework by comparison, isn't really very useful for anything other that just that...contact tracing
the way the contact tracing framework ACTUALLY works makes it doesn't really make it useful to them.
they could lobby to change it
they can lobby with or without the framework being implemented