Contextual Interactions
I keep wishing there were some way to respond when something significant happens in a sim's life. The pie menu is really bloated if you have a lot of packs, and yet it seems to be missing what often intuitively feels like the right response. My sim can comfort his dog when she's sick, but not his wife. My sim can ask her father if he's a mermaid but can't confront him about cheating on his wife. Sims can take selfies with pumpkins but not their children. Sims can't introduce a new partner to parents or friends.
I've had sims' loved ones get struck by lightning, win Starlight Accolades, get into a preferred college, get married, win soccer games, and pass out in public, and there wasn't anything substantial I could do in response. I've often found it really surprising (and disappointing!) when I couldn't have a sim celebrate another's accomplishments or support one who's going through something difficult. I'm not talking about generic compliment or help out interactions. Many of these events are significant enough to have their own interactions. It would make sims seem more connected.