Why does Chapter 11 of the Sai Satcharitra emphasize devotion to a Guru in a physical form?

Chapter 11 of the Sai Satcharitra explains that devotion to a Guru in a physical, or Saguna, form is essential for a devotee who also possesses a physical body. The text states this is a determination of the scriptures, reasoning that "As long as the worshipper has a form (body), the Guru must also be in a physical form." It further argues that without meditating on this manifest form, true devotion can never arise. This loving devotion is considered crucial, as the chapter describes it as the force that allows the "bud of the mind" to open and bloom, which is a necessary step in a devotee's spiritual progress.