More NPCs (Firemen, police, burglars, social bunny)
More romance interactions (slow dancing)
Spiral staircases.
Roommates.
Newspapers.
Cars.
Open world.
More baby interactions. Heck, even Sims Freeplay has more options for babies than Sims 4 does.
CRIBS. ‘Nuff said.
Did I mention cribs? CRIBS!
More detail. In Sims 3 your sim could occasionally choke on their food while eating, which I thought was pretty funny.
GROCERIES!!!!!!! I don’t like that your sim can cook whatever they want, whenever they want, without the ingredients. Just ruins the realism.
Favorite things (colors, food, music genre)
Star signs. Even though they don’t really do much.
Online dating, if anyone remembers this feature.
Create a style!
Attraction system.
More. Traits.
DOORBELLS!!!!!!!
Better, more dangerous career chance cards.
Weather. I know this was added as an expansion pack but it should be in the base game.
Graveyards. I don’t want to bury Granny in the backyard. -_-
That’s all I can think of.