August 2017 - last edited August 2017
It's important to note that any unplayed households that are not housed on a lot are at risk for culling when they are marked as unplayed. That means 'Unplayed' and 'Not in world' Sims can be deleted/removed autonomously from the game, if you should reach max population (180 Sims?). This is actually more of a danger than people think because the game continuously generates unnecessary and hidden characters. The only way to prevent is culling is with mods or by keeping all of your favorite Sims moved into lots, or 'Mark as Played.'