Why are some biographical works, such as those by Shri Dasganu Maharaj, considered less suitable for detailed Parayans compared to the Shri Sai Satcharita?

The preface in Chapter 0 draws a clear distinction based on comprehensiveness. While the works of Shri Dasganu Maharaj are respected, the biographies of specific saints contained within them are described as not being comprehensive or detailed, often taking up only two or three pages. This brevity makes them less suitable for an immersive Parayan or Saptah. In contrast, a work like the 'Shri Sai Satcharita' is explicitly praised for being a detailed, poetic, and comprehensive biography written specifically for such devotional study, allowing for a much deeper engagement with the saint's life and teachings.