The architect knows what to do when he starts using the work of the DD. file format? What makes your job easier? How much work is worth where DD is worth. use formatting formats? How do you approach unknown architects to talk to me at all?
Most Architects conceptualize before anything so giving them truth ground provides a much better canvas to start with. This allows them to be more specific with their design and the opportunity to do less rework later if the project comes to fruition. Most Architects also have a source to get the ground data, but it is often very outdated and comes in the form of points and CAD linework which is not very visual.