we defo need more gameplay changing lot traits.
like saddening lot which makes people feel sad and randomly can cause a sim to "sulk" which basically makes them take a seat and complain to themselves or something like an emotional doubling lot that doubles the impact of angry, sad, embarrassed, uncomfortable, bored and inspired moodlets resulting in a very mood driven environment that can be both positive and negative.
i'd love to keep away from skills and moods personally but i cant think of a lot trait that wouldnt be annoying after a while if it didnt impact moods.
though sims traits and moods need a huge overhaul to what they do instead of just a lame moodlet, they need to impact gameplay and autonomous game play much harder