A rule of thumb: in Poser, we pretty much consistently use subjective assessment to discount objective fact. We use what we see to prove or disprove what cannot be assessed visually. (Like hyper-colours, for instance).

It's really quite simple, folks. Poser needs linear data to process colours correctly. Poser Pro offers that capability within the software, Poser 5-6-7-8 do not. You can try to argue that away, but it remains a simple, incontrovertible fact. BB has provided a material-room solution to accomplish that. Take it or leave it.

Whether or not the solution is correct (as opposed to corrected-sRGB or some other colour-linearising schema) or whether this solution produces better images is entirely up to the user to decide.

Whether Poser processes colours correctly using PoserSurface without some form of colour-linearising is not a matter of discussion.

It does not. Simple as that.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks