In what ways is the Shri Sai Satcharita described as being more than just a simple biography of a Guru?

Chapter 0 of the preface clarifies that the Shri Sai Satcharita is far more than a standard Guru biography. It is lauded as an 'excellent succulent poem,' rich with literary devices like illustrations, metaphors, and ornaments, achieving 'aesthetic fulfillment.' The author, Annasaheb, was even bestowed the title 'Mahipati' by a contemporary scholar, likening him to a great hagiographer. Beyond its literary merit, the book is described as a 'sweet, spiritual treat (Prasad-meva)' for seeker-devotees. Its purpose transcends mere storytelling, aiming to guide seekers to satisfy Shri Sai-Paramatma through a 'sacrifice of knowledge' and ultimately merge with the Divine, making it a powerful tool for spiritual transformation.