Originally Posted by
Kathranis
Oh, and here's the thing about scenarios, dungeons, and raids: dungeons and raids are handled by two teams, one which is responsible for level design (creating the dungeons) and one which is responsible for encounters (creating the bosses). Creating a dungeon means not just designing a layout, but completely designing the dungeon, painting the texture maps, placing the doodads, and ultimately incorporating the whole thing into the world, now that flying mounts are available (unless it's a literal dungeon or a cave). And then the encounter designers come in to design and balance the boss fights.
Scenarios, on the flip side, can be made by any team working on the game. They're easy to design. A lot of them were designed by the quest team as a way to convey important story points. So Blizzard can easily make 2-5 scenarios every patch without affecting raid design at all. If they were to implement 2-3 new heroics, that means that the next raid tier would probably be a couple wings smaller.