Why does Chapter 11 emphasize the need for a devotee to worship a Guru in a physical form?

Chapter 11 strongly advocates for devotion to a 'Saguna' or manifest Guru, particularly for a devotee who themselves has a physical body. The text presents a clear principle, stating, "As long as the worshipper has a form (body), the Guru must also be in a physical form; for the formless, the formless is suitable—this is the determination of the scriptures." As explained in Chapter 11, meditation on a manifest form is crucial because without it, loving devotion cannot fully develop. This devotion is what causes the "bud of the mind" to open and bloom, which is a necessary step for spiritual progress.