I can't think of what every pack needs.
Expansion Packs:
Get to Work: Updated aliens. Control a U.F.O., summon meteors, live on Sixam.
City Living: More festivals
Cats & Dogs: Strays, and dog walkers in other worlds (so I don't need mods)
Seasons: Kite flying
Get Famous: Ability to create bands, more instruments; drums, bass guitar, electric guitars
Island Living: Surfing, active lifeguard career
Game Packs:
Outdoor Retreat: Sleeping bags
Parenthood: Slumber partys
Vampires: Vampire Hunter career, aspiration
Jungle Adventure: Interactive snakes, Sims should get a fear buff at least
Strangerville: Active scientist career at the lab, but different from Get to Work
Stuff Packs:
Cool Kitchen Stuff: Toaster, or deep fryer
Romantic Garden Stuff: slow dancing (so I don't need a mod)
Backyard Stuff: Telescopes
Kid's Room Stuff: Easy bake oven
Fitness Stuff: Exercise bikes
Spooky Stuff: Harvestable pumpkins
Bowling Night Stuff: Claw machine, arcade games
Base Game:
Live in Sylvan Glades
Any simple thing I don't need mods for.