The problem is that "on the fly" subD doesn't equal a high(er) rez mesh.

CC SubD (As well as Posers polygon smoothing) can smooth a mesh.

But they can't add mesh detail.

To add mesh detail to a low res mesh, you need displacement maps. Which introduce their own sets of problems.

Catmull Clark SubD is a "nice to have" feature, but definitely NOT a proper replacement for what can be done with a "proper" high res figure.

Even games these days have no problems any more with higher res meshes, so turning back the wheel to the Dork and Posette days with ~20.000 polygon meshes really doesn't make any sense.

If your machine can run Poser 9 or PP 2012 (Because that is needed for Genesis anyway), a high res version of Genesis will have zero impact on it's performance.

Too many polygons are bad.

But too few are even worse.