As to the "traditional filler of twenty-first century realist fiction," maybe that is something I avoid. I don't relate to standard psychologizing in novels. I don't really believe that the backstory is the story you need. And I don't believe it's more like life to get it - the buildup of "character" through psychological and family history, the whole idea of "knowing what the character wants." People in real life so often do not know what they want. People trick themselves, lie to themselves, fool themselves. It's called survival, and self-mythology.