Why are some works, like those by Dasganu Maharaj, considered less suitable for a detailed Parayan of a single saint compared to the Shri Sai Satcharita?

Chapter 0 explains that while one can perform a Parayan of the works by esteemed poets like Shri Dasganu Maharaj, such as 'Shri Bhaktalilamrut,' these texts are not ideal for a deep, focused study of a single saint's life. The reason provided is that the biographical sections for any given saint within these larger works are not comprehensive or detailed, often spanning only two or three pages. In contrast, a work like the 'Shri Sai Satcharita' is a detailed, poetic, and comprehensive biography dedicated entirely to Sai Baba, making it far more suitable for an immersive Parayan or Saptah as intended for deep devotional study.