Playing every Lunar as Carnivore Beast Boy is far too versatile and difficult to control for any form of balancing to make any kind of sense. It also makes creating a working Charmtech for them almost impossible. “Why buy wilderness survival Charms for a character that can turn into a camel or a fish or a bird?”
Shapeshifting has always been a means, not an end, and basing the entire splat around it had the problem of being both a pigeonhole and newbie trap at the same time. It forced everyone to do the same thing, and made you insanely powerful… except when it didn’t.
If I were rewriting Lunars from the ground up, I’d probably drop it as a default power entirely and keep some extremely limited and controlled version of it somewhere in their Charmtech.