Why is a comprehensive, detailed biography considered superior for Parayan compared to other texts that might mention a saint?

Chapter 0 explains that for the purpose of a Parayan or Saptah, a detailed and comprehensive biography is essential. While other works, such as those by Shri Dasganu Maharaj, may mention saints, they are often not suitable because the biographies are not detailed, sometimes spanning only two or three pages. A detailed poetic Guru biography, in contrast, allows for immersive study. This not only constitutes a profound service to the Guru by the writer but also enables other devotees who study it to achieve the purpose of their lives, making it a more effective vehicle for spiritual merit.