My contact list offers one indispensible feature --- it supports call filtering.
For years I have run my Android phone continuously in "Do Not Disturb" mode. This mode can be easily configured so you must be on my list in order to ring my phone.
I can still see unknown callers and I can call them back if/when I choose but they don't have the privilege of making my phone ring on demand.
I find that life is better and much more pleasant this way.
Can Calltags do this efficiently without a contact list?
But it is a good idea, and I think it can be done nicely with some more special tags and rules for types of tags. I'm not sure, but I'll work on it. Thank you for the idea.