The assumption is that life doesn't need to be navigated with lessons. You can just do it intuitively. After all, you only need to achieve autonomy from your parents, find a moderately satisfying job, form a relationship, perhaps raise some children, watch the onset of mortality in your parents' generation and eventually in your own, until one day a fatal illness starts gnawing at your innards and you calmly go to the grave, shut the coffin and are done with the self-evident business of life.