That's not true. All RoS modules have an automated content Import
When you activate modules, they show the following dialogs:
If you mean "Actors are not copied from the Compendium to the World" - it was done on purpose for
performance reasons (the more actors/items you have in the world, the longer it loads and slower for players). It's always better to have everything in Compendiums and import only stuff you need for the game.