Yeh it's been like that since The Sims 2 somehow the game would always predict right who would make the best partner for my Sims, it tends to match them up more with people who have similar interests more than Traits which is accurate to real life really... we find Friends and Date people with similar Likes and Interests. You see it the most when you tell your Sims to visit a Nightclub or Pub and now especially since they now sit at the Tables your Sims tend to reach out to people the game thinks your Sims will get along with the best and they reach out to your Sims.