Well, you can clearly see in the video that on 2sided foliage the mask isn’t even considered.
I suppose you could manually work around that by multipying it into the subsurface input.
sub surf color * texture should equal the adjusted texture value.
Why? Because on foliage the opacity is used for the foliage, not to manage the tint of subsurf scattering.
On the skin though, because a profile is in use I do not have the luxury of managing my own color pin that I can use to modify the subsurf by.
the Opacity input is supposed to do that.
it does so, to the extent that you get A result.
it fails to do what it is designed to do, since you get a non gradient effect from using a gradient…