| http://www.w3.org/ns/prov#value | - Professionals criticized SketchUp for its imprecision and impurity (it was not exact, not a solid model, it was not robust (you cannot document a big project) and it wasn't a real professional CAD application (meaning it was not expensive, as if free was a liability) but it SketchUp filled a vital need and so grew to the be the biggest CAD user base in the world.
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