Mmmmm mm, peanut butter and bananas. Bananas are a great fruit because of how subtle they are. Practically anything can be combined with bananas, and it will form an acceptable flavour.
The meat of an avocado, guacamole thus included, is still deadly to a wide range of birds.
Furthermore, my parrot is intelligent enough to know which parts are intended to be edible, and would ignore the leaves and peel off the skin, obviously not eating its ginormous seed, if he were given the chance. But that intellect would be useless considering the poison that is avocado.
It evolved to be swallowed practically whole by giant herbivores, who have since gone extinct, and has no role in the modern day foodchain except as a novelty item paraded by gringos which is hazardous to some of the most fundamental life surrounding humans.