What small update would make a big difference for you?

These would include:

Adding an extension to Del Sol Valley since many of us have requested it.
Making an ability to add lots where you want to the game if if those are in a new neighborhood, "Like that deco house? Click on that deco house and make it playable."
Fixing the bugs in Dine Out restaurant service - this really needs to happen along with fixing the excessive clay ball spawning and the autonomous brewing of potions by guests if you have a barbecue grill.
New romantic animations because these really need an update.
Fix the pizza delivery - looking at you, Canadian bacon pizza. Add more delivery options including some that are not pizza.
There was a bug with some staircases if they haven't fixed that.
Let pets gain social skill by playing with each other so they aren't quite as needy at least if you have two.
Very minor but if we could slightly lengthen the space for names, that would be great. Some of my sims have longer names.