Bunnies are meant to specialize in 1v1 combat, even the game tells you this in character creation. This is why their Pure Job gets a huge increase in 1v1 attack power.
A Hybrid Bunny is what uses AoEs because it's hybrid, it sacrifices some 1v1 attack power in order to use AoEs that the Buffalo uses.
That's how the Pure/Hybrid system is meant to work. You're supposed to have a gain and sacrifice for whatever side you choose. You give up the ability to gain these benefits, but in return you gain these other ones.