"You can easily shuffle around uv maps in uv edit pro" That's my point , i have seen several messages with this explanation { No affence} but the real trouble in my opinon is that with the layout of the uv's created in earlier versions of the "unimesh" there where so many overlapping uv's that there was no point in trying to really fix it not just scaling it down to fit  in 1 uv space. With V4 this is much improved { just a few overlapping uv's} I think the great thing is that the mesh is all quads , I suspect daz is going for subdividing themself. What I'm disagreeing on is that with 1uv set you can't enough resolution in the places you want. I think it depends on the layout you create {still testing myself } Here's a map a created with gives good overall dispacement i think { critiques accepted}