And again I call BS.

Sorry.

Maps won't show in OpenGL. HD morphs do.

That is a BIG advantage in my book.

Creating precision JCMs with maps is trial and error.

Not if you can actually "see" the morphs while rigging.

Nope, if there weren't massive advantages over "old" tech, DAZ wouldn't have put that much money and time into their delopment.

Project high details to lower poly mesh, create your jcms there. Professional Artists that have to do this for a living isn't clamoring for an HD tool as it's not available; neither should you.