I love astrology/zodiac and am extremely well versed in sun, moon, rising signs, what they mean for someone's personality etc. however, I think this approach would make it much more complicated than it should be.
I would absolutely LOVE for zodiac to be in the sims 5, but I think in CAS you can assign their star sign, and it might make them more susceptible to different emotions. I think it would be good for it to be based on times of year too, so if your sim were to have a baby in the fall, it could be a Scorpio, or in the summer, Cancer etc.
I think that would please the people that would love to see the return of star signs, and it's not such an invasive feature that people who have zero interest, would have to learn about.