Why does Chapter 11 argue that having a physical Guru is necessary for a devotee?

According to Chapter 11, devotion to a manifest (Saguna) Guru is essential for spiritual progress. The text makes a scriptural argument that as long as the worshipper has a physical form or body, the Guru must also be in a physical form. The reason provided is that devotion cannot truly manifest without meditating on this Saguna form. The chapter further explains that until loving devotion occurs, the 'bud of the mind' does not open or bloom. This blossoming is necessary to produce the fragrance and nectar that attract divine grace, implying a physical Guru is the catalyst for this internal spiritual process.