A thread:
It says that Brahman is all that exists and our material world (Maya) comes from ignorance.
The Brahman is not a God. It is beyond any quality - it isn't intelligent, good or bad. It just is.
At its core, this level denies the duality of subject and object and says they both are the same.
The concept of Karma and Dharma ensures that society has net positive interactions. And the rituals and idol worship ensures everyone knows who is in the camp
The symbols - the idols, the chants, the rituals - take a spiritual dimension on their own, but these are subserviant to the belief in one Brahman - the essence of the world.
The suggestion in Gita that one must do work without an expectation of reward is towards minimizing psychological anguish.
- METAPHYSICAL: Tat tvam asi. You're it [it = Brahman]
- SOCIETAL: Rebirth, Karma, Dharma and Rituals
- PSYCHOLOGICAL: Expect no reward
Rather than a bug, I think it's a feature.
It ceases to be a philosophy if you can't interpret it on your own.
If you have your favorite ideas, let me know. I'm diving deep into Indian philosophy these days.