In praxis this is allmost unachievable. It can easily be formed into a wide variety of shapes without overly complex and expensive tooling, though it is not the easiest material to manufacture consistently, so pair-matching isn't quite as exact, which may affect imaging, depending on the precision and quality of production and its control. Its mechanical properties can be varied over a usefully wide range. Paper cone properties can be easily altered with coating to achieve desired properties, though many paper cones are coated largely for aesthetic purposes and not for enhancement of acoustical performance of a driver. Paper properties may change with time more than other cone materials.
Paper is a material that sounds better than it usually measures.
The biggeest streghts are excellent selfdamping, potentially excellent resolution and detail, very flat response without excessive peakes and dips because of a gradual cone breakup. These fillers can be used both to control costs and to alter the mechanical properties of the material. Polypropylene cones tend to be inherently well damped with the result that they can deliver smooth, if not terribly extended, frequency responses. The material itself and the methods used in manufacturing cones with it are such that tight tolerances are easily achieved. In the early days of polypropylene use it acquired some bad reputation due to a fact that it's a difficult material to bond.