I thought Likes and dislikes was suppose engage more with personality, individuality, and emotion.
Sims would gravitate towards what they Like, and automatically do what makes them happy, and stay away from what they dislike, or be uncomfortable, Scared, Sad, or angry., if they had to do what they dislike.
Bringing a sense of fulfillment to the character. people could bond over common interests and explore their friend's interests, or even judge others.
I'm hoping it develops further, certain Traits and life states, can unlock more Likes and dislikes.
I'm hoping My sims will come to like/dislike certain foods, and automatically lean towards making/choosing those sorts of food instead of making something random, to be able to choose if your sim liked Savory, Spicy, Sweet, Fruity, etc.