I think that main problem is renderer. Modeling is brilliant but world now working on milion render solutions like a redshift, arnold, renderman, octane render (not for mac version without cuda) …
And old version AI format version. For example affinity photo/designer doesnt know to import rhino ai format. (but its another problem)
It should be possible to create some UI for selecting render passes, and being able to save them out: I don’t know if that will make it into v6, though. Some passes are already being done, but not all by a long shot.