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Also, I'm mystified as to why this is even of interest, when in Poser we have not just virtual displacement mapping, but REAL displacement mapping.

Sorry, man, I'd have to disagree with that.
"REAL" displacement mapping involves micro-poly displacement of a subdivided model; the displacement map imitates huge displacements of a polygon model in the millions, while using only thousands, in subpatch, at render time.
Poser can't subdivide a mesh, at render time or at any other time. Yet.
Is one of my UberPoser wishes. ;-)

Uh - Mike, Poser (REYES) displacement is precisely and specifically called micro-polygon displacement. Sub-D has nothing to do with it. There's no need to conflate Sub-D with micro-poly displacement.

Let me ask you this. If I showed you a cube (six polygons) that with Poser displacement looks in all ways exactly like a sphere, would that prove to you that displacement in Poser is real and complete and capable of transforming a low poly shape to look just like a high poly shape, or no?

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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)