The problems are that when every warlock and hunter in a BG has a pet named "Pet", you have no idea which one has which pet at a glance when they're close together, and you can't make macros for quick targeting to banish/fear them, which is especially bad and to use the buzzword, non-Blizzlike, with warlocks who normally have unique demon names by design (and can't rename them to their own name, which hunters often do to mess up targeting for their opponents).