Understand what you mean, it would be easier in the long run.  But modelers have a different mindset about structuring mat zones for different models, in their own way, they believe texturing would be simpler and easier.  Creature models don't necessarily follow any convention, yet they benefit just the same when applying EZSkin.  

Now figure the nightmare you can face when attempting to script Genesis 2 after a UV change, you have all the mat zones duplicated in G2 and generation 4 nomenclature and trying to determine which set actually appears in Poser.