Yes, true.. with ngons not deforming well and better to plan for quads/tris only.  However, for those wanting to import already created models in from other apps, this would be helpful. 

Smoothing groups are a royal PITA in Poser though.  Having to bevel edges or detach polys or increase poly count in certain areas..well you already know.  Figuring out a sub-d that works would be fantastic.

Rendering of large poly count objects in poser IS the problem.

Anyway, there are work-arounds for most of these issues but I do hope SM or whoever gets around to this, as things like this will improve poser's functionality.