Sims 4 

MAJOR MISSING FEATURES: (All were in base versions of Sims 3)
No create a style (CAST) – NOT possible in future expansions
No family trees
No Mac version of the game at release (or announced)
No modifications to world/public spaces – The park in the demo is a mix of a community lot and public space
No “normal” careers – Law enforcement, Medical, Business, etc. were removed
No open world – You must incur a loading screen between each active lot; each neighborhood has 1-5 lots total
No pools
No terrain tools other than paint; everything is perfectly flat
No story progression – Sims in the neighborhood age, but do not have children, get jobs, move, get married…etc. without player intervention
No toddlers – Nor were they combined with “enhanced” babies
No way to create/place new lots – And you only have 2 empty ones at the start of the game!

MAJOR CUT BACK FEATURES: (All were in base versions of Sims 3)
All buildings on a lot must have the same foundation. No mixing for sheds, garages, etc.
Babies are mere objects – All interactions are through basinet. There are no baby objects. Babies can only be lifted directly above basinet.
Backgrounds are illusions – The buildings in the background are not playable in the game.
Completely FLAT lots – The entire build-able world is completely flat
Fewer floors/levels, limited to three
SIGNIFICANTLY smaller “worlds” of <25 lots compared to 125+ lots in TS3
Smaller lots – Lots are limited to 50×50 instead of 64×64.
Loading screens for individual lots
The map is a one-dimensional picture
Teens are same height as adults and they, along with elders, all look nearly identical.

OTHER MISSING GAMEPLAY ELEMENTS: (All were in base versions of Sims 1, Sims 2, or Sims 3)
No acne
No aliens
No animated hair
No aspiration failures
No babysitters (as NPC for hire)
No bartender (as NPC for hire)
No basements
No bobble head for selecting actions
No bookstores
No burglar alarms
No cars (not even as décor)
No cemeteries
No cutscenes
No cleaning skill
No clothes shopping
No color wheel, predefined to ~20 colors
No comfort need
No curfew
No customization of multi-tone hair color (users select only main color)
No diseases or illness
No dreams
No environment need
No eyelash length slider
No favorites (food, color, music)
No fears
No full face make-up
No garage doors
No gardener for hire
No ghosts
No grocery stores
No male body hair
No move object cheat
No newspapers
No opacity slider for makeup
No party invitations from other Sims
No portraits
No private school
No rabbit holes at all – Sims move offscreen for work and school. There are no hospitals, work/school buildings…etc.
No random or accidental deaths
No repairman
No repo man (one thing which was replaced in the game)
No restaurants
No skin slider
No still lifes
No swimming/swimwear – Including lakes, fountains, etc.
No tragic clown or social bunny
No way to watch a Sim commute to work/school
No website for browsing exchange or store (in-game only)
No zodiac signs

MISSING OBJECTS: (All were in base versions of Sims 1, Sims 2, or Sims 3)
No bikes
No changing tables
No cribs
No dishwashers
No highchairs
No hot tubs
No pool tables
No trash compactors

32-bit executable – TS4 is not 64-bit, and cannot access more than 4GB of RAM. If you have more than 4GB then you are crippled.
Fewer traits in CAS (more traits must be unlocked/earned in-game)
Incompatible Simpoint currency – Sims 3 Store Simpoints do not work with TS4

No burglars
No cashiers
No Create a World
No exterminator
No swings
Premium Membership is REQUIRED to get certain sets on release day or at all
No inheritance
No interests
No magazines
No pinball machines
No way to water flower beds/bushes