I'd vote no on any iteration of Astrology in the game. I don't understand any of that and have better things to do with my time than figuring out a system like that. I mostly ignored it from earlier Sims games, and found TS1 slightly confusing for how its personality system was so tied to it.
I wouldn't mind if numerals were brought back for some basic traits, as long as we still have traits like TS3. And I want more than 3 of them. I'd like for them to effect more than common moodlets as happens in TS4.
IRL Personality theory is a deep topic of research, and no matter what you read in pop-psychology, there are more dimensions to a human than most personality tests allow for. Research isn't even sure right now how many there are.