What is your least favorite/worst expansion pack?

I bought Eco Lifestyle on sale out of curiosity to see what it was like, but I got quite bored of it fairly quickly and I almost never use the relevant gameplay features. Also it’s one of my least favourite packs when it comes to the clothes selection that came with the pack as well, but that’s just my opinion. Maybe I’ll find a use for it someday, if I decide to do some kind of related challenge, but it’s the pack I’ve enjoyed the least so far.

To answer your other question, I actually don’t think any addition/change is needed for the pack’s gameplay and/or CAS material. It’s just that it turned out not to be to my tastes, and I don’t expect my tastes to be catered to all of the time. It’s not just about what I want and that’s totally fine!