"Smoothing by material" is phong shading, which Poser can also do (pretty much any 3D tool or game can).  This won't affect the sharp corners that are visible in the profile of a model, but D|S does included Catmull-Clark subdivision, which must be applied to the entire model.  Poser (Reyes polygon smoothing) is actually more controlled in this aspect, since polygon smoothing can be turned on or off by bodypart.  For D|S it's the whole model, and a lot of models that are designed for Poser's polygon smoothing won't work with it (which is what we've been discussing).

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