So, for production network and server gear, I like domain names
built with city and site codes:
site.city.domain
I don't think anyone's saying you can't also do that. Using CLLI or
IATA or whatever alongside router names works fine, and using CNAME's
allows you to provide both a functional name and a hostname for your
device.
We've done this for many, many years, and it works fine.
... JG