Personality should be the main focus of this game.
Why not make it the priority? CAS & Build in TS4 is the greatest its been in the series (imo). I love other unique features like the gallery and first person view. However, what is a life simulat...
I kind of prefer personality points over the moodlet system with traits. It always felt too rpg when they introduced them in the Sims 3. There was a nice variety of how Sims acted in the Sims 1 and 2.