Culling, Relationship Culling & Decay: Current Status

@Sharee
If the game is creating new Sims, it needs them, it's the way it's programmed. When you go to the vet for example, it looks for Sims that match some filter (like having a pet). If there isn't any, it will create one. Sometimes the filters are a bit more complex (traits, age, at work or not, played or not, etc), so you may lack some specific types of households, that the new EP needs.