While I agree that there are textures floating around that have too much burned in specularity and shadows, I completely disagree that textures used for Poser (Or Studio) should be sanitized of all highlights or photographic detail to be useful.

There is a limit what displacement can do, that's why DAZ developed the HD morphing system.

But there is also a limit what the native render engines in Poser (Or Studio, for that matter) can do.

So going "all displacement" or "all sculpting" won't give you the 100% perfect Photorealism you're after. Maybe with a high end render engine, but not using Firefly.

You "pay" with a lot of additional work and render time (High res displacement maps or very high res subdivision), while getting little back in return.

And if you want to edit out all what makes a photographic texture an actual photograph, why bother with taking a photograph in the first place ?

If I follow your logic, given that every detail is physically there, a pink floodfill texture (maybe with a clever procedural shader) would be all what's needed to create a photorealistic looking render of a human being.

You "theoretically" might be right, but I doubt this approach would be practical in any way - Especially when we're talking "One click" photorealism.