Because a verse isn't merely a song but also includes the words, gestures and actions of the characters in a play, the dayu's narration sounds strong, something like the objective description of events.
詞章が、単なる歌ではなく、劇中人物の台詞やその仕草、演技の描写をも含むものであるために、語り口が叙事的な力強さを持つ。