Knowing that their time and resources are not infinite, decisions have to be made about where to direct manpower. How much value would be added to the game by making unique gear appearance for this dungeon? Is it so important that there should be less content overall to divert those artists to this task? Reusing assets is an important tool to increase the volume of patches and is used by every videogame developer ever. It would have been very wasteful on resources to only use the baelsar's wall set once ever. No asset recycling would mean a slower patch cycle or less volume per patch if keeping to the same deadlines.