They've been doing it with the devils forever, using Osyluth and bone devil, cornugon and horned devil, gelugon and ice devil, etc. interchangeably. I personally like it, because you get a sense that there are common terms and technical names. Like, Paladin McInt-is-a-dump-stat just says "Yeah, it was a super lusty demon. Guess I'll call it a lust demon" but among wizards and demon cultists, the proper name is used.