I like to think of astrology as a fine grained personality shorthand like Meyers Briggs.
the magical star-assigned fixed personality is dumb. what's useful is being able to tell Becky to stop being such a Capricorn and come out and party, even if she is a cancer or whatever. it's just a memey way to reference behavioral traits if your friend group already knows what they mean. i don't know how to explain this any better