As a family player, I am not satisfied with TS4. Young adult and adult get the vast majority of the focus, while the other age groups have barely anything to make them unique/interesting. Teens and elders only have a decent amount of clothing options because they share it with YA/adult, but the majority of those clothes are unfitting for those age groups. And they barely have any gameplay elements to make them feel individualized. Children just feel like adults with less interactions most of the time and they're very much shafted in terms of new stuff. Toddlers are the only age that feel unique, but they are still hugely lacking in terms of gameplay and horribly lacking in terms of CAS and BB. And of course babies are literal objects.
I'd like to see more for elders, teens, kids, and toddlers; more clothes, BB objects, and gameplay unique to them. And of course, I would like to see a massive baby overhaul. If they can accomplish that at some point, I'd be satisfied.