I agree with Seasons for sure. And I really think that CAW is important because hypothetically, you could create a world and then define the seasons for that world. I know there are some people out there that don't actually like the weather/weather effects, and a CAW tool could potentially let you make a world that doesn't experience the weather. Anyways seasons definitely.
And any system that provides personality depth which includes the attraction system and reputation. This kind of stuff is just..no matter if you play occult or realism or solo Sims or families, it's just important to have tools that flesh Sims out no matter the gameplay. To that point, occults and pets/animals should also be in the base game. Just put all life states/living beings in the base game of a life simulator, for goodness sake.
To jump on what @jcp011c2 has said, if these things get added to the base game, that's one less thing that the EP/GP needs to create. Instead the game could continue to be expanded upon. For example, and I'm not saying this is the best idea, but if you had cats/dogs/small pets in the base game, later on you could have some sort of zoo or wild animal pack.
