Yeah, that is mostly what I was describing. There's some rough security benefit to using more transient A/AAAA records under a GUID or other pseudo-random DNS name than a DNS zone that just encodes common link local addresses. There are definite security benefits to a company using mycompanyrouters.com instead of their home company.com (XSS scripting attacks and the like). So some things have changed over 10+ years, but yes the basic principles at this point are pretty old and certainly working in practice.