Honestly I am surprised more real estate agents don’t already bake this into the workflow. Thinking about Zillow as well. There should absolutely be a way to identify all the folks during your home search (buying or renting) that are on the registry.

I found that realtors can't even do basic searches to determine which ISPs serve the house.

To expect them to be aware of multiple GIS layers is likely way out of their normal scope. Maybe it shouldn't be? But thats how things are now.

You, the client, should also do your own data collection from public and semi-public sources for things that are strictly outside MLS data capture.

Of course everyone is ultimately responsible for what they purchase but with the commission earned on a few % off a 500k+ transaction I would expect them to do it.