Why are some biographies, like those by Shri Dasganu Maharaj, considered less suitable for a detailed 'Parayan' or 'Saptah'?

According to the analysis in Chapter 0, the suitability of a text for a comprehensive 'Parayan' or 'Saptah' (a week-long reading) depends on its detail and length. While Shri Dasganu Maharaj's two biographies of Sai Baba are praised as being excellent and graceful, they are also described as being 'very short.' The text explains that if a devotee wishes to perform a Parayan focusing on a single saint's life, biographies that are not comprehensive and take up only a few pages are not as useful for that purpose. This is contrasted with detailed works like Shri Sai Satcharita, which were specifically written to be suitable for such extensive devotional study.