When I turn on the news at night, I don't see the information for the county I intend to visit once it's deemed safe(er) to travel. I see the information for where I live.
Yes, we already have to do this at the state level, at the moment. It's in the best interest of a region's government (whether county or state) to make sure the rest of the country is aware of their rules, so they don't have people showing up with incompatible expectations.
I don't imagine there will a increased multiplicity of confusing rulesets beyond what we have now, either. Many counties will simply adhere to some standard recommendation from their state, and the rest will copy one of a small number of recommended levels along a spectrum of openness.