For anyone interested in realism, the idea of having extra divisions of material zones is a waste.

I didn't let odf put a lip zone on Antonia, because I did not want anybody ruining her appearance by cheating on the lip color as a separate zone. No hard edges. Antonia is a state of the art figure and is easily given new lips and lip colors without resorting to a material zone. You use shaders and masks - it's just not that hard.

For other apps that don't have shaders or they're hard to get to, such as Daz Studio, these extra zones are helpful, especially for users who don't care about hard edges or the edges won't be visible (such as a wrist edge for a glove material).

Since Daz figures are supposed to be easy to use in DS, they have extra zones. You'll notice that Poser figures have head, body, end of story.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)