Why are detailed biographies of saints, such as the Shri Sai Satcharita, considered so important for devotees?

Detailed Guru biographies are considered vital because they facilitate a specific form of devotional practice and service. According to Chapter 0, by studying and performing 'Parayans' (devotional readings) of a comprehensive poetic biography, a devotee can perform Guru service. This service not only benefits the individual devotee in achieving their life's purpose but also provides the writer with the merit of serving God in humanity. Chapter 0 notes that in Maharashtra, detailed, poetic, and comprehensive works suitable for such Parayans, like the Shri Sai Satcharita and the Brihat Guru Charitra, are exceptionally rare, which enhances their importance for followers.