When doing Friendly socials with other Sims, "Discuss Interests" is one of them but you have no idea what their interests are so maybe they could be chosen by players. For example, if two Sims meet each other and they find out their interests are Fishing or going to the gym, then maybe they could send each other a message inviting them to workout at the gym.
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would give them some personality
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And in the sims 3, there were traits like “good sense of humor” or “no sense of humor.” But in ts4 comedy is a skill: anyone can be funny whether it is in their character or not.
If there was a way to control interests, it could affect out-of-the-blue skill gains, which I would love. So if my sim has ZERO interest in comedy, they can watch comedy on TV and not gain the skill. They can make baaaad jokes and not get any better at humor.