We can't add lots since because of the way worlds work. Not only that but I have heard from certain modders in this forum that The Sims 3 uses an external software to create world( I cannot remember if it is maya but pretty sure it was from something like that) whereareas in TS4 they don't use an external tool to create worlds, everything is handcrafted. The close world system affect it too. For example, we got to remember that there are no neighborhood system in TS2 unlike in TS4. That means that every neighborhood is it's own world, and only the map ingame is categorizing them into one world but every single one is different. Unlike in TS2 where it was unified.
That is not to say it wasn't possible. When ask about it years ago why we still do not have the tool while it was possible to make it, SimGuruGrant said that it might not pay off the hard work unlike say toddlers, pools, etc. because only a small portion of players would only create worlds for the game......
On the bright side they did say that they are now spending more time with content updates than ever.....but yeah.....Wish we have it back.
