In fiction, the characters have their own lives. They may start as a gloss on the author’s life, but they move on from there. In poetry, especially confessional poetry but in other poetry as well, the poet is not writing characters so much as emotional truth wrapped in metaphor. Bam! Pow! A shot to the gut.
There is an incessant influx of novelty into the world, and yet we tolerate incredible dulness. I need only suggest what kind of sermons are still listened to in the most enlightened countries. There are such words as joy and sorrow, but they are only the burden of a psalm, sung with a nasal twang, while we believe in the ordinary and mean.