More Storylines like Strangerville
I know this is kind of controversial since a lot of people didn't like the addition of a little rpg storyline (for reasons I don't understand) in Sims 4 when Strangerville was released but I personall...
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Scenarios game them the framework to build this in to any kind of pack. Pre-made households could come with a scenario that fleshes out their family bio. They could make special scenarios for each pack that you can attach to your own sim and replay again, just like resetting the mother plant. It's also so easy to ignore scenarios if players don't like them; all you have to do is load in and end it early. Scenarios for pre-mades would also give that Sims 2 flavor of loading in to a family at an important time, and taking the decisions from there.
