It would be amusing though, to stumble upon a, say, Pisces forum where members try to figure out their behavior.
That is why it is important to fill these void with fluff. But that fluff requires some mythos otherwise it wouldn't hold the fluff together. There's a subset of these 2 religions that doesn't require you to believe in anything aside from the fact that "consciousness exist". However, this concept is quite hard for common folk to grasp. This is why I think that it is important to create a layer on top of this that the masses can feed unto.
The problem with using astrology as the basis for religion is that it doesn't correspond to reality at all. Simple statistical analysis would yield weird results that doesn't match with reality. How do you reconcile being bad at something X despite being born at month Y that supposedly makes you better at X. Or why does X today when my horoscope is Y?
Why not? I just read it like any other book. When the Bhagavad Ghita says that there's nothing before and after my existence, that is true as far as I am concerned. I don't read the whole thing like a gospel nor do I think Buddha was correct on everything. He was just another person trying to make sense of things like the rest of us. When the Dhammphada says that I shouldn't dwell on emotions and that I am not my emotions; I can easily get the intuition by using the simulation hypothesis which is something that the people of old didn't have the luxury of.
That's just sociology playing out.
I mean, these "self-introspection, consciousness-obsessed cultures like Hindu and Buddhism" are a source of hatred and violence. The Hindu majority is India is on this brutal trend. And in Burma-Birmania-Myanmar, the Buddhist population was almost unanimous in supporting the discrimination against muslims and the ethnic cleansing of Rohingya. People feel they belong to a religion and that those who do not are unenlightened strangers. The phenomena is well known and studied: religion leads to intolerance.
Astrology is stupid, but at least it does not create that feeling of community, so it won't spread intolerance and xenophobia.