Traits lack depth, how can they solve this?

I think the biggest issue with the traits is that they rely too much on the (already flawed) emotion system. If I were to try and fix the issue myself, it would involve separating the two, or at least making the trait moodlets more impactful (not in terms of emotion strength, but in terms of extra effects).

I also think adding unique features for certain combinations of traits would be good as well. For example, maybe a sim who is both evil and hates children will have unique interactions/reactions that a sim with just one of those traits wouldn't have.