Plastic is not a material type, as a substance it can have huge visual variety.
The idea of using ever more specific material types to try and describe the infinite variety of reality…
I am not familiar with arnold’s approach.
We do not want presets/templates, we want a universal tool with an underlying logic that relates to our understanding of the real-world.
Re. PBR, it is now a common standard, so makes sense to offer support. Personally I have no problem loading pbr stuff into maxwell, but many users couldn’t work it out.