IMHO, from a Dev perspective, it's just easier to keep things non-hairy: props, placement, texture, color, rendering, etc. Earlier pubic + body hair products weren't always foolproof or convincing, I felt. So, those may have been some practical factors in this case.
Plus, if one character has pubic hair, then would that mean the rest should, lest some of them stand out oddly? Well, except for Elena, perhaps. Essentially, that forces a normalization of hair and if the Devs were already shy of adding such, then they'd possibly punt altogether on the idea.
I noticed that ICSTOR offered a mix in Milfy City, but even that was minimal (and, they are a rather talented Daz3D artist).
I can post some comparisons in the art thread with my amateur version of D, if curious.
Of course, some people just like the shaved look - which is still quite common in "professional" adult porn, it seems.