This. It's what it is likely used for most, I'd bet. It literally puts in the walls and doors too, so you don't need to add them, as you said.The maps can be directly imported, included sight lines and lighting, into VTT's. No, true, it's not a VTT in and of itself. But, you take Dungeon Alchemist, wed it to Fantasy Grounds (for example) and you're good to go.