Why is a detailed, comprehensive biography like the Shri Sai Satcharita considered more suitable for Parayan than shorter biographical sketches?

The preface in Chapter 0 explains that while shorter biographical sketches of saints exist in works like Shri Bhaktalilamrut, they are not ideal for a dedicated Parayan or Saptah. This is because they are not comprehensive, often spanning only two or three pages. In contrast, a detailed, poetic, and comprehensive work like the Shri Sai Satcharita is considered highly suitable. By studying and performing Parayans of such a detailed biography, a devotee can fully immerse in the Guru's life and teachings, which facilitates a deeper form of Guru service and helps the devotee achieve the purpose of their life.