This Convenience is from the Simplicity tradition.
The writer believes that the work has been overly complicated, or has been presented as being too mystical or complex.
She tells her readers that luck and coincidence have little to do with a good dream.
A pleasant dream is whatever we (each of us or groups of us) consider to be a pleasing combination of images, meanings, etc.
In Truthful Analogy
Independent of coincidence, or fortuity of any kind,
the very ground work and basis of Dream Harmony
is simply a pleasing ensemble.