You know, I always say musicians, they can do it on their own. They can practice their violin on their own. A painter can paint by himself. A writer can write by himself. But an actor needs a group, and the hardest thing about expanding your ability and your craft is to have a group to do it with that is of a caliber where you can grow even more.
I have never heard a dancer asking for advice about how to stay focused on her footwork, or a painter complaining about the dull day-to-day task of painting. What task worth doing isn't worth daily effort? Do you think Michelangelo was having fun the whole time he was on his back painting the Sistine Chapel's ceiling.