What does sims 2 have that is lacking in sims 4

You could created your own worlds in the Sims 2 and the Sims 3. That's definitely something that's lacking in the Sims 4. In the Sims 4, you basically have to make do with what you got. You can visit any world that you want, but you can't add any new ones outside of the official worlds without mods, and even those mods that I've heard about that add a new world, replace one of the existing worlds.