> I don't think multiple owners share the same hostnames. That's exactly what I mean, this approach wouldn't be able to handle unconstrained sharing of systems

> I don't think multiple owners share the same hostnames. That's exactly what I mean, this approach wouldn't be able to handle unconstrained sharing of systems among multiple users. If you're, say, a freelancer who has access to a bunch of people's systems… and another freelancer has access to half of those, and then a bunch of others… these combinations create exclusions that can make the whole thing unsolvable if they're large enough.