OK, so the short answer to my main question (What is the PURPOSE of the Joint Editor?) seems to be "If you are not creating your own character, it's rare that you would ever need this feature." Got it. That's what I thought. Since I don't make my own characters, I will probably never use it... EXCEPT... except for the "Zero Rotations" button.

My guess is that only a tiny percent of Poser users will ever create their own characters, so 99% of the time the Joint Editor window is opened is only to get to the "Zero Rotations" button. So why isn't there a "Zero Rotations" option on the menu? (My suggestion that there should be a "Zero Rotations" button in the Cloth Room was just and offhand remark not to be taken seriously.) The "Zero Rotations" button, the Figure>Zero Figure menu option, and the Edit>Restore>Figure menu option do NOT do the same thing. Neither do the "Zero Pose" poses that many vendors include with their pose packages.

At one point I ended up writing my own zero poses and in the process realized that it wasn't a trivial exercise. Should a zero pose just address the rotations? What about translations and scales? What about expressions? What about morphs? What about Morphforms?

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OS: Windows 10 64-bit, Poser: 10