This comment suggests that the various lokas and beings inhabiting them can be taken metaphorically, i.e. it said,
Many of these can be answered with references back to metaphorical interpretations, by both traditional lineages and by the modern secular Buddhism movement. If I were you I would ask questions about the meaning behind the metaphorical language and how it can be applied to solve the problems of life and death.
So, as a follow-on from that comment — i.e. if or when they are interpreted metaphorically:
Is there an overarching metaphorical meaning of the 31 lokas, and the various kinds of beings that inhabit them? What is the meaning, and how does this meaning help the practitioners of Buddhism, and all earthly beings?
Wikipedia descrides the Bṛhatphala planes as follows — unless this reference is inaccurate, would you explain how its metaphorical meaning can help practitioners and all earthly beings?
These two realms are a result of attaining the fourth jhana. They remain in the tranquil state attained in the 4th Jhana, and is characterized by equanimity (upekṣā).
22 - Unconscious beings (Asaññasatta) Realm of mindless beings who have only bodies without consciousness. Rebirth into this plane results from a meditative practice aimed at the suppression of consciousness. Those who take up this practice assume release from suffering can be achieved by attaining unconsciousness. However, when the life span in this realm ends, the beings pass away and are born in other planes where consciousness returns.
21 - Very Fruitful devas (vehapphala deva) In the Jhana Sutta of the Anguttara Nikaya the Buddha said "The Vehapphala devas, monks, have a life-span of 500 eons. A run-of-the-mill person having stayed there, having used up all the life-span of those devas, goes to hell, to the animal womb, to the state of the hungry shades."