I just took a workshop with Susan Messing and even her throwaway comments were illuminating. The thing that clicked with me in regards to this was, “No backsies!” If you do something that you can go back on, it’s probably a weak choice or could be better implemented. A strong choice gives something for you, your partner, and the audience to have fun with.
The example I’ve seen her give a couple times is a woman who walks on stage thinking and acting she’s playing a man but gets labelled as a woman. Now she’s playing a woman who walks and talks like a man. That’s way more fun.