Why are some biographies of saints, such as those found in the works of Shri Dasganu Maharaj, considered less suitable for a formal Parayan or Saptah?

According to the information presented in chapter 0, some biographies are not ideal for the specific devotional practice of a Parayan or Saptah due to their lack of comprehensiveness and detail. The text uses the works of the poet Shri Dasganu Maharaj as an example. While valuable, the biographies of individual saints within his larger works, like Shri Bhaktalilamrut, are often very brief, sometimes spanning only two or three pages. This brevity makes them unsuitable for a dedicated, week-long reading (Saptah) or a complete devotional reading (Parayan) that is focused on a single saint's life, which requires a more detailed and extensive narrative.