Why are some earlier works, like those by Shri Dasganu Maharaj, considered unsuitable for a dedicated 'Parayan' of a single saint's life?

As explained in Chapter 0, earlier works by esteemed poets such as Shri Dasganu Maharaj, including Shri Bhaktalilamrut, are considered unsuitable for a Parayan or Saptah focused on a single saint for a specific reason. The text clarifies that the biographies of individual saints contained within these larger works are not comprehensive or detailed enough for such a purpose. It is mentioned that these biographical sections often take up only two or three pages. This brevity makes them inadequate for the deep, immersive devotional reading that a Parayan entails, which is why a more detailed, dedicated biography like the Shri Sai Satcharita is highlighted as being far more suitable.