"Weight map architectures differ. Three axes versus one matters. Bulge maps versus rotation maps matter as well. Poser offers both. What's missing?"

A proper way to create JCMs inside Poser, like Studio has built in for a couple of years.

Not that I'm unhappy with PoseMorphLoader, but it is too important to be not fully integrated into Poser.

Actually it is way, way more important than weightmapping.

 

Again: I can easily create perfectly realistic looking joints without weightmapping as long as I have reverse deformations functionality to create JCMs.

But I have yet to see a single convincing weightmapped joint that does not use a single JCM.