Restricting played sims from showing up on lots outside their world?

This (along with lack of lots) is why I came to headcanon "everything is San Myshuno and suburbs". Well, Sulani is still several hours flight away, but I glued Selvadorada neatly to Sulani as two different cultures within the same nation.

And quite honestly, after having played with this headcanon since 2016, I'd be severely put off if the game suddenly introduced official distances and tried to prevent my Del Sol Valley sims from going to Windenburg whenever they want.