I'll admit to having run some dungeons unsynced before just to take screenshots in them.

I'd love to be able to explore these areas at my leisure, though I don't feel a great need for them to be functioning areas with quests/NPCs for that. Just let me go into an empty version of the dungeon. Not that I'm opposed to them adding quests and such to these areas either, but most of them are so confined that I don't feel as if they'd be able to make very good "open-world" content for them without massively expanding the areas, which would probably not be something they'd want to allocate resources to.