From a substantive new interview with Joshua Rothman:
I had felt for many, many years that the form of the novel, as I used it, created a distance from life. When I started to write about myself, that distance disappeared. If you write about your life, as it is to yourself, every mundane detail is somehow of interest—it doesn’t have to be motivated by plot or character. That was my only reason for writing about myself. It wasn’t because I found myself interesting, it wasn’t because I had experienced something I thought was important and worth sharing, it wasn’t because I couldn’t resist my narcissistic impulses. It was because it gave my writing a more direct access to the world around me. And then, at some point, I started to look at the main character—myself—as a kind of place where emotions, thoughts, and images passed through.