Why have likes and dislikes?

I like them. It's true they don't add anything dramatic to gameplay, but whenever I get a like/dislike notice for a sim in the house I'm playing it makes me pause for a second and actually think about my sim. A couple of times having that notice come up has given me a new angle on how to play a sim. One teen is now a heavy gamer and hates gardening while his sister hates video games and loves gardening and fishing. As a result I'm getting a clearer idea about how I want these two sims to develop - the boy is going to be more indoorsy while his sister loves doing things outside. The only drawback is that they are Vampires, so I gotta watch the girl so she doesn't go fishing or something during the day.