I've seen Chicago Pros' youtube video about ceramic and graphene comparison (I remember both coatings were high level consumer products, not "pro" products) and saw for those two coatings that polishing - to paraphrase an old Bill Cosby line - "Murdered 'em and bumped them off". I assume that for a silicon carbide coating a __lot__ more polishing would be required to do the same.
So far I've not found the video where Dr Beasley talks about graphene. Pan the Organizer has touched on graphene .vs. ceramic but suggested ceramics are proven while graphenes are still in early stages. Hopefully in future this neophyte will learn the true differences (my hunch is it's the matrix substrate, not the graphene, which makes a "graphene" coating work).
Pan also mentioned clay baring a ceramic coating could damage the coating, so I'll stick to infrequent chemical decontamination as maintenance.