Cursed objects and lucky objects
Ok, so this is a weird one, but I like some unexpected drama in my game. Sometimes, every once in a while an object could be secretly cursed and cause problems until it's discovered, then you get to choose what to do about it. Replace it, cure it somehow? But until then it has the effect without you knowing what's doing it.
My first thought was supernatural stuff, like cursed artifacts that might make sims lose energy fast, or be unlucky in love, but then I realised there could totally be everyday and funny examples too. Like we've all had a coffee pot that always makes awful coffee, or a computer that keeps crashing and slowing us down at work.
On the flip side, some artifacts or objects could have positive hidden bonuses that are revealed later. A computer could be great for learning, or a coffee pot could make great coffee, or a stove could be really good for baking.
The objects in our homes are unique, typically some are great and others suck, and it gives our homes their own personality and changes how we live in them.
All of this could be revealed through gameplay. And if an object is cursed the value should go way down, and if it's lucky it should go up.
I feel like this would make objects less like everything is generic out a catalogue stuff and potentially give them unique aspects that make us think about them and what they do more. Most are standard, but every once in a while you'd get a great object or a dud.
The cursed lot trait could make cursed objects more likely. Spellcasters could be involved too in trying to add, remove or change how cursed/lucky an object is.