RedPhantom posted at 5:23 PM Sun, 10 October 2021 - #4428751

The old legacy content used geometry switching to swap a hip with genitals with one without it. It is obsolete and breaks the newer geometry. You can read more about it here https://www.renderosity.com/forums/comments/4427931/permalink as well as a workaround.

It's not obsolete in the slightest.

It's very very useful in figures that are mechanical, segmented, robot, etc. It allows you to swap out any number of body parts via a dial; the parts are unique geometry (unlike morph) that can contain their own unique UVs, material definitions, and morphs. If you are only looking through the lens of a Poser figure that has welded body part groups and requires unbroken or mesh continuous bends I can see where this might seem to be the case, in fact, by and large, there are more Poser figures in existence that DON'T fit that criteria. Most likely many aren't even aware of the hidden functionality, it's simply a few instances of code and a geometry file reference in a cr2. 

Just wanted to point this out, it's a topic that been of interest to me and also a concern about changes or deprecation of Poser features going forward.