Why are some biographies by authors like Shri Dasganu Maharaj considered less suitable for a focused Parayan compared to the Shri Sai Satcharita?

The preface in Chapter 0 clarifies this distinction based on comprehensiveness. While works by poets like Shri Dasganu Maharaj are valuable, they may contain biographies of saints that are only two or three pages long. This brevity makes them unsuitable for a dedicated Parayan or Saptah focused on a single saint. In contrast, a work like Shri Sai Satcharita is described as detailed, comprehensive, and written over six years. This depth and breadth make it an ideal text for the immersive study and devotional reading that a Parayan requires for devotees to achieve the purpose of their lives.