Quote - I find it hard to understand why people would not welcome CC subd, or a similar technology in Poser?

It is not that I would not be welcome it, LOL! Any tool is welcome. If Poser were a geometry building tool this, or something like it, would be indispensible, and Maya, 3DS and the others have rightfully invested. When developing you start rough, and then need a method increase the grid density where you need it for definition or to add more detail. Poser however is not a geometry building tool and it does not pretend to be. For the function it does perform: combine, bend and display geometry definitions built elsewhere, other priorities prevail. A mesh densification method may come in handy in some cases for doing touch-up, but if there is a serious issue to be solved, you better call in the real stuff right away. 

Quote - Making morphs is actually easier with fewer polys to push and pull.

For morphs affecting a large area there are magnets, that work irrespective of the number of vertices. More vertices give more control. > Quote - (note the discussion in the link above).

If you refer to the discussion under 'Subdivision Surfaces': As far as I can see that  refers to the grid of attraction points of a splined surface, not to vertices actually defining the surface as we use them in Poser.