It's very time-consuming work, and it takes so long to get projects off the ground that you might work on only a few amazing things in your lifetime (if you're lucky!) There are so many different types of projects to explore, and so little time.

Animation is expensive in every conceivable meaning of the word. It is generally a massive team sport if you want to make anything longer than a few minutes, so using the medium as a form of personal expression is exceptionally hard.

It takes a rare kind of insane person to use animation (of a feature quality) to tell a personal story the way a live-action filmmaker would.