If you are like me and are tempted to get The Sims 4, it may be good to check out the site below first.
There is a comprehensive list of all missing features that were in previous iterations of The Sims.
Of all the missing features, the deal-breaker for me is no story progression. Maybe it is just me but I love creating a sim and "plopping" him/her into the world to see how he/she lives/survives (IMO, The Sims 4 should have improved upon the basic (without mods) story progression mode found in The Sims 3). Perhaps someone will create a mod in the future for this but until then The Sims 4 has just dropped out of my list of anticipated games.