Gamma 1.0 is not "natural" - in the same sense that the way Poser 7 renders is not natural.

Gamma 1.0 in Pro is keeping things the same as Poser 7 (in theory).

What you have shown is that when gamma = 1.0, Pro renders same as P7.

What you have not shown, or seen, is that when you use gamma correction correctly, Poser 7 renders start to look wrong, except in rare carefully tweaked circumstances. When gamma is planned and the shaders do the right thing for gamma correction, the results are better than Poser 7 results, and you do not have to carefully tweak to get there.

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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)