I am not a technical person. My shader is a result of "monkey see, monkey do." The shader is meant to be used without ever having to open or edit the main node and you certainly do not need to understand what is going on inside of it to use it. It's like a different version of the physical root. Also, the physical root has bugs in it that make it not render all lights in a reflected or diffuse surface in a GPU render. (kind of important if you want faster renders in Superfly.) Also the PR does not do refraction. Take a look at the JPG that I included in the zip that explains what the various parts do. The PR is basically a compound shader that is hard coded and the user cannot open it up and look inside.

I use my shader on EVERYTHING and it always makes the image better.

W10, Ryzen 5 1600x, 16Gb,RTX2060Super+GTX980, PP11, 11.3.740