to draw a quick resumee without going into details:
- pro vvvv users would apparently sacrifice simplicity for flexibility and quality.
- metal/roughness is the preferred workflow
- substance designer defines some kind of standard
however, the first goal should be a node that you put into a patch, connect geometry and renderer and that's it. This node could of course be a module that internally uses a shader and default textures/cubemap...
inputs would ideally be same as Phong, but only one color input with additional metalness and roughness inputs. also only one light for a start...