Ghost bones still don't have the infinite granularity a JCM has. You are still tied to a map. Antonia isn't a good example because her shape lacked nearly all antomical detail. The more detailed, the more complicated a figure's default shape is, the more complicated the fixes will have to be. As for creating them, since PP-2014, I do them all in Poser using the MorphBrush and the PoseMorphLoader script. I always tried to keep things as simple and backwards compatible as possible, and a JCM is just an ERC-controlled morph, so it doesn't break any of the existing "helper" tools that were developed over the years. People tend to get carried away with "cool new stuff", but my priority was always to create improvements that were "idiot-proof", so to say. Mainly because I wanted my figures to be as easy as possible to use for myself. :-)