Why are comprehensive, single-saint biographies considered more effective for Parayans than shorter accounts found in other collections?

The text in Chapter 0 explains that while some works, like those by Shri Dasganu Maharaj, do mention various saints, the biographies within them are often not comprehensive, sometimes taking up only two or three pages. For a devotee who wishes to perform a Parayan or Saptah focusing on a single saint, these brief accounts are not ideal. A detailed, poetic Guru biography, on the other hand, provides the depth necessary for immersive study. This allows both the writer and the readers to properly engage in Guru service and achieve the spiritual purpose of their lives through focused devotional reading.