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Because that's the whole point of having a coordinate-based system--if you don't, you basically lose all the important functionality a coordinate-based system offers that can't be done in a room-based system. The rest of the functionality described here could more easily be implemented in either a room-based system, or a hybrid system. If all locations in your coordinate system are point objects, and do not have volume, all you've really done is masked a room-based system by replacing each room with a bunch of autogenerated rooms for each point on the grid.
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