"We recommend only selecting two expansion packs at a time"

Crazy stuff, sometimes I wonder if it's something in the water at EA.
They actually recommend we don't use their products?!

How does that even work? My towns would crumble, houses disappear, families wiped out, community lots vaporised overnight. I run everything including 11 eps, stuff packs, store content and CC, game hasn't exploded on me yet.