Well, I'm really not familiar with how Poser deals with mapping textures onto objects that don't have explicit UVs, so I'm basing it on how some other apps deal with it. Such as a planar projection, spherical, cylindrical, and so on, which are not exactly "real" UVs in that the projection can be altered and animated at any time within the program - stretched, moved, rotated, etc.

"Traditional " UVs are just stuck there, permanent, unchanging.