I've been directed by other actors, and being an actor doesn't make you a good director.

Matching character and actor is what a good director does.

If you do well as an actor, a good director will pick up on it, and keep it in the film.

It does make you a better director and a better actor.

A good director creates an environment, which gives the actor the encouragement to fly.

There are definitely reasons to do certain things, but I like to stick to good director, good actor, good script.