Diversity and depth for Sims.
I read a lot of people complain about Sims having not much to do. But new activities, skills, careers and so on are added with every new pack. New Clothing and accessories are as well, but they don't...
Forum Discussion
I agree about the likes and dislikes, as that would indeed help a little with differentiating sims and the way they are played. As for things like their favored hand or body hair, sure it might be cool, but in the end it's mostly cosmetic, so it wouldn't change that much for me. And I still really want new jobs, aspirations and activities.
