How does astrology help express emotional needs and wants? Is it something that only works for some people, whose emotions happen to match those predicted by astrology?
A way I could see it work is that you get a series of (randomly generated) statements about who you are. You then go through them, and either say "yes that's me" or "no that doesn't fit". This exercise helps you reflect on your identity.
Then you might communicate to someone else "I'm pretty <trait x> for a <sign a>". Then they know that you have <trait x> and <trait y> (because it is associated with your sign and you didn't reject it).
Then you might communicate to someone else "I'm pretty <trait x> for a <sign a>". Then they know that you have <trait x> and <trait y> (because it is associated with your sign and you didn't reject it).