Why are some of Shri Dasganu Maharaj's works considered less suitable for a Parayan focused on a single saint?

While works by the poet Shri Dasganu Maharaj, such as Shri Bhaktalilamrut and Shri Bhaktisaramrut, are valuable, the preface in Chapter 0 clarifies their limitation for a specific type of study. If a devotee wishes to perform a Parayan or Saptah focusing solely on a single saint's biography, these works are not ideal because the biographies within them are not comprehensive or detailed, often spanning only two or three pages, which is insufficient for in-depth study.