I am surprised to see that in the last paragraph of your letter you say, "it is an indisputable fact that the Bhagavad-gita (not to mention the Vedas) does not require such constant chanting.
But I am surprised to see that in the last paragraph of your letter you say, "it is an indisputable fact that the Bhagavad-gita (not to mention the Vedas) does not require such constant chanting." I think, however, that you have missed the following verse in Bhagavad-gita, apart from many other similar verses.
- satatam kirtayanto mam yatantas ca drdha vratah
- namasyantas ca mam bhaktya nitya-yukta upasate
- (BG 9.14)
The engagements of the Great Souls, freed from delusion and perfect in their realization of God, are described here: "Satatam kirtayanto mam"—they are always (satatam) chanting (kirtayanto) My glories, and "nitya-yukta upasate"—always worshiping Me.
So I do not know how you can say "indisputable." And, if you want reference from the Vedas, I can give you many. In the Vedas the chief transcendental vibration Omkara is also Krishna. Pranaba Omkara is the divine substance of the Vedas. Following the Vedas means chanting the Vedic Mantras, and no Vedic Mantra is complete without Omkara. In the Mandukya Upanisad, Omkara is stated to be the most auspicious sound representation of the Supreme Lord. This is also confirmed again in the Atharva Veda. Omkara is the sound representation of the Supreme Lord and is therefore the principal word in the Vedas. In this connection, the Supreme Lord Krishna says, "Pranaba Sarva Vedesu" (B.G. 7:8)—"I am the syllable Om in all the Vedic Mantras."