My experience is that old style poser poses work fine in G2F/M, as long as applied to the hip.  I don't every try to apply .duf or other studio files to G2F/M for this reason.

 

This would be more of a problem if I had any Genesis2 pose products, but I only have the one that came free with Victoria 6, and I would never use any of those, far prefer to use my old V4 pose collection, which are all Poser format poses.  I have no idea whether DAZ sells poser format poses for Genesis2 in any of their current pose products, though I would suspect so.  Thought I would mention and hope it helps, Stan