Improved trait system: Toddlers stay the same, Kids get 2, Teens get 3, Adults / Elders get 4 OR TS3 route
Better autonomy
More unique sim AI (why the plum are they all computer and phone obsessed)
Better toddler care taking (it's terrible)
Make babies like TS2 & TS3 babies (not glued to a crib)
Less awkward animation interactions (seriously it looks weird and not genuine)
Slow dancing and just regular dancing
Witches
Servos / Plumbots
Fairies (I never got to try them in TS3)
More fantasy (seriously there's a huge lack)
University
Generations
Supernatural
More love for Elders (they get pretty much nothing)
Prom
Just more life states in general
More traits
Rework traits
Imaginary Friends
Tree houses
Home videos
Rework GTW Hospital for delivery events (You can't even bring more than one sim over what if I want to bring the whole family over for the night)