Hiya :)
The biggest thing I would love to see (and you probably hear this a lot) is more in-depth babies. I love family gameplay but with the current babies it feels like they aren't part of the family and just a object you keep in the house till you age it up. I would love for babies to be able to go out to lots with their family and not be left behind or be taken on walks in a pram. Even the ability to move a baby from one crib to another so you can move the baby into a different room would be great.
Also, I would love to be able to change the occults of pre-existing sims in CAS. When I start a game I use a saved sim so I dont have to make a new one each time but when I want to play with witches or vampires it can be a bit of a pain to copy every feature onto a new sim.
Finally, it would be great for teens to be more like teens and not mini adults. For example, sneaking out, throwing eggs at houses, prom etc. My favourite part of sims is the family gameplay but toddlers and child are the only life stages that make sense and once aged to a teen it is almost like they are an adult.
Thank you! :)
EA Staff (Retired)