Routines - set a schedule for your sims

I think that would be great. The only thing I've seen Sims adapt to is completing homework on their own if they've got high enough grades (either that or there's generally nothing to do on the lot).

I imagine the moment you start a new household, every Sim starts out with default autonomy. Their traits, likes, and dislikes will obviously play a role in it, so if they're a bookworm, they'll head to the bookshelf instead of the computer. The moment you start playing them more however, they'll gradually adapt to whatever you usually do with them. If the player commands them to use an object, that object will be added to their autonomy pool if they spend a good amount of time with it. Again, their CAS traits will either increase or decrease the chances of them performing them. It's like Sims will steadily build themselves a Top 10 list of favorite activities that is ranked based on how often they use them, whether they gain a positive or negative moodlet from it, their traits, their likes and dislikes, their current emotion, etc. (Players can potentially set this up for them automatically if they want.)

Some objects are NEVER touched by Sims autonomously, nor are they ever repaired as often. If an object breaks, most Sims will attempt to repair it, while Lazy or Slob Sims ignore it. The higher their handiness skill, the more objects they'll be willing to repair on their own.

Sims 3 had a system where you can use an object until your Sims levels up in the skill it's associated with. It even shows what time the action is expected to be finished at. That would be really useful.

The scheduling system can honestly be implemented in the base game calendar or Parenthood bulletin board. Instead of just a small interaction menu, you'll get a full menu with an exact time you want to schedule curfew and what activities are being done in the household at any given time, whether it's for the whole family or each individual Sim. Young adults and older will follow it to a T, but teens and younger might stray off depending on their behavior. Player-made Get Together clubs can also have a set time to hold meets that'll show up in the calendar.

I really hope these all come in either a huge QOL update or even pack refreshes. The level of customization in Get Together's club system needs to carry through a lot of features in the game and its packs.