World Manager + Simple Create a World Tool - My concept

Even though I'd prefer a CAW feature something like this would not be bad to have I have always felt Willow Creek Manolia Promenade and Newcrest should have been one single world all in one map. I loved how they would expand on the world in Sims 1 making it bigger as more expansions came.

Or they could do this even better...
https://simsvip.com/wp-content/uploads/2019/01/Map.png