This is what I see as genius: the genius of simplification.

Simple, you say? Well, yeah, sure, but who would have thunk it up? You took 24 hand-placed shader nodes and turned it into it into 4... with maths.

Another tick for maths. This is incredible stuff, Bill... THANK you!

Oh, and I'm pretty sure I got it... that Add() node Value_1 drives the whole thing, right? .5 density is like 75% opacity, .3 density is like 51% opacity, which is 49% transparency? etc...

You could make that a PM: Opacity node - forcing people to think in terms of those transparency channels as opacity channels.

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