For the purpose of devotional readings like Parayans, why are poetic biographies considered more suitable than prose biographies?

The text explains in Chapter 0 that for devotional practices like study, recitation, Parayan, or Saptah, detailed poetic biographies are the most suitable format. The primary reason provided is that there is no established tradition of performing these intensive readings with prose biographies. Furthermore, from a practical standpoint, prose is difficult to memorize. Poetry, on the other hand, is easier to commit to memory, making it the superior choice for these spiritual exercises that benefit from deep and repeated engagement with the text.