Did they ever give a reason why only the base mesh is exported by the CR2 Exporter? Especially since we know from Reality that plugins are capable of accessing the fully subdivided mesh in Studio for export.
Well, technically Reality only gets a subdivided mesh - you can’t repose in Reality can you? You can do that with Poser too. In fact, I’m aware of at least one Poser user who advocates that route to get the best out of Genesis in Poser.
However - on to the main question. Yes, they have given a reason for it. I have not put in the time and effort to try and find out how correct they are, but the general gist of it is that the Genesis rig is designed to work with the base level resolution of mesh and DAZ Studio relies on improving the definition of the mesh after posing. Increasing the density of the mesh (without increasing the definition and possibly the complexity or the rigging) and THEN posing would likely result in a figure that poses less well - possibly much less well, with problems showing up that would need corrective morphs. Since Poser and DAZ Studio use different mesh smoothing algorythms this could mean that a subdivided Genesis mesh would be a worse experience than a fairly low poly Genesis.
I do not know for certain whether Poser or DAZ’s abilities with Poser are the more limiting factor in this equation.
A side note to consider is that earlier exports of Genesis seemed - if done incorrectly, one assumes - to be far lower resolution than the current version. Additionally, there are two Genesis mesh options - “Base Mesh” and “High Resolution”. These are visibly different within DAZ Studio in hidden-line view, but I’m not sure what the difference IS as they appear to have the same number of vertices and facets. Interesting.