As far as being territorial about one's own life, that's a mistake for ANY writer. All writers everywhere, in every genre, are drawing from their life and the lives of those around them for "material." Memoirs just make transparent and even amplify that activity.
Lidia YuknavitchPoetry, for example, goes so deeply into the space between corporeal affect and deep emotion (even primal in some cases) that, as Emily Dickinson said, it can blow the top of your head off. Poetic language is sometimes misunderstood as "abstract" when in reality, it's precise - precisely the language of emotions and the body.
Lidia Yuknavitch