everything can be used as a starting point for introspection. as long as the focus is on the introspection, that is fine, but at least things like extrovert and introvert are based on observable human behavior, but ideas drawn from astrology are divination that is completely unrelated to human qualities or experiences. anyone trying to claim more than that is either deluded or a fraud. people taking astrology seriously are a red flag for me. i would not want them as friends even, let alone a partner.
or in other words i am open to be proven wrong when it comes to character types. if someone can come up with a better explanation that completely eliminates those types, i'll be interested. but i don't for my life believe that there is any repeatable observable benefit from applying astrology, that can not also be explained as pure coincidence.