Why are Shri Dasganu Maharaj's works, like Shri Bhaktalilamrut, not considered ideal for a focused Saptah on a single saint?

While one can perform a Parayan or Saptah of Shri Dasganu Maharaj's works in their entirety, Chapter 0 clarifies their specific limitation. The text states that if a devotee wishes to perform a devotional reading focused specifically on a single saint's biography, these works are not useful. The reason provided is that the individual biographies contained within them are "not comprehensive or detailed, often taking up only two or three pages." This brevity prevents the kind of deep, immersive study over a week that a dedicated Saptah requires for a single saint's life.