Veins would have to show a colour. Muscles not. So if you don't have a coloured texture with coloured veins, I don't see how with the displacement map they can show properly. A displacement map would have to be done over a coloured texture, and not generally for a character only. Each body is different from the other. I would never purchasing a generic displacement map to apply over a woman. Veins for someone are shown in a place, for other are shown in another place, and DO have their own colour.

You may showing those maps only for a few of renderings, but you can't use it always. Don't know if does have a sense, just trying to explain.

In this rendering am showing a fast work done with the displacement map worked on the  skin texture of THIS character. Wouldn't go with any other. (Beeing an intim character's part I had to hide half of it).

What DAZ did is technically right because is an accurate work, but does not consder the difference between each human people. Mostly if we speak of veins.

Andy