Ñāṇa wrote:The sutta collections are a complete package, and restricting oneself to only a limited subset of sutta teachings erects an artificial, self-imposed barrier.
I think there is an imposed division here between "subset" and "complete package".
It is not a question of restricting to a subset of suttas, as there is not an artificial, but a rather natural 'barrier' (of understanding) in every sutta's listener.
Each sutta is spoken at a certain location to a certain person, e.g. there are Bhikkhus, priests (Brahmins), wanderers of other sects & householders, Kalamas & Kosalans, there are Bhikkhus & Bhikkhunis who speak as the Buddha does, and those who are scolded by him.
Wisely discerning to whom the Buddha spoke is a step in understanding a sutta. For example, he gave marriage advise to a couple seeking marriage advise. It is an expression of his compassion. But that does not mean a serious meditator should concern himself with marriage (unless bound by law).
Also, there are teachings on devas living in clouds, but that does not mean that rain dance is part of the Dhamma.