Srila Prabhupada:
"That will be sufficient for your preaching work if you simply reproduce verbatim the purports which I have given in the Srimad-Bhagavatam and chant Hare Krishna with ecstasy. As you do it seriously and sincerely, Krishna gives you more and more strength for this noble missionary work."

reply to Vijay Venugopal
Maybe I have an incomplete impression of the bhakti vrksa program, because I am judging from the practical applications I have seen - I have actually never read the manual. But I have attended many bhakti vrksa programs around Europe, Australia and Bangladesh. And after discussions with the participating and leading devotees I gathered those impressions. So maybe those programs I have visited were not so exemplary.
Sometimes it might be easier to introduce a new program with a strong focus on 'boiling the milk', rather than adding it to a program which has been existing for many years, but with incomplete application.
Your servant, Devaki dd