One thing I fear we need to accept from a BST job is that any variety in pet will be entirely cosmetic, or we will end up with a situation similar to Summoners and Scholars were only one pet ever gets used.

Tops I could see two pet roles, a Tank for over world soloing and a DPS pet for in dungeon, and limit "glamours" to the pets. BTW, by this I don't mean they all need to behave the same way, but lets say you get a Scorpion pet, and a Tiger pet, they both potentially would have their own sets of auto attacks and AoEs, but they all will always do the same amount of damage and have the same area coverage.