Removing the option for Open World. That's the main reason why I loved and still love TS3. You play with a town, not just a house.
Only one loading screen, even if it was a little longer than the millions we encounter in TS4.
I hope in the future (The Sims 5) they'll reintroduce Open World, even if it's just a mix of TS3 and TS4. Computers will have the power to play an Open World Sims game without crashing or lags in the future.
Having loading screens to visit your neighbor next door and another one to go back home just breaks the immersion.
