If my Sims was alot smarter then today, I expect I woulöd feel like an intruder or an peeping tom when they performed intimate options for example like woo hoo. Even today I prefer not to look in when...
It's not just about being "smarter" or improved AI, but it's also about sims acting and reacting according to their individual personalities. Here is the one great area I believe TS2 spoiled me....