So here's something to consider when it comes to Poser meshes - and maxxmodelz kind of touched on it - a Poser model has to be able to do more than just one thing. It would be safe to say that a large portion of the Poser user base care only about still images and that's fine. However, that isn't all that a Poser figure needs to do. 

Currently a Poser character mesh needs to be appealing - this does not mean it has to be physically beautiful but that it should have forms that are appealing to the eye (example - Barney2 has more pleasing shapes than Barney does).  A Poser character mesh also needs to pose well (it could be argued this is more important than having pleasing shapes). That means finding a mesh layout that works best for posing for that character's form and supporting it with a rig that takes advantage of the mesh's strengths while downplaying its weaknesses (because every mesh will have both). It then also needs to be able to animate great facial expressions - this will be a combination of mesh flow, morphing and rigging and can fall apart at any of those stages.  Then it needs to have enough geometry to take on different shapes both in the face and in the body. Then it needs a good UV set and great textures that aren't only photo based but a blend between hand painted and photographic reference. Unlike the majority of models out there, Poser characters are intended to do more than just one or two things.

So there's a lot involved in making a Poser mesh. Finding a mesh that works is a constant evolution of thinking. It's trial and error at the end of the day. In skilled hands and with the right tools you can make any mesh into anything you desire - heck I turned a sphere into a demon the other day, so it's all about being willing to explore possibilities and not get set into one way of doing something, as maxxxmodelz has pointed out.  One of the things we're doing in the content team is constantly exploring new ways of doing things. If you look beyond just the "realistic" humans that come with Poser, you may find signs of those experiments. We test, we distribute and if found successful we incorporate. Constant evolution.