I've used systems with web-based building, and while I like it for objects and npcs, I don't for rooms. Why? I think it's because I like to wander through an area, adding tweaks, exit descriptions, and other extras as I go. It's hard for me to envision unless I'm virtually "inside" the room, and able to wander around. I'd think it would prove confusing for mapping out areas as well.
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