dunno what anyone else thinks but I don't think using the Bortle scale helps people understand what you're trying to communicate any better than, say, "heavily light polluted urban sky" or "exquisitely dark sky with no light pollution" or something in between. Sure, it's shorter, but is the idea being communicated to anyone who doesn't already know who and what Bortle was/is? not really. and we're stuck with using a guy's name in a time when we're trying to stop doing that. you end up with the same problem seismologists have with the Richter scale.