The article mentions using "standard lithographic techniques". Wouldn't it run into the same issues with extreme ultraviolet patterning that silicon fabs now face?
Another reason is that it's abundant, and it goes without saying that it's a carbon sink. It's also an extremely flexible material, mechanically and otherwise.
My impression is that you can do stuff with carbon that you can't do with silicon unless you dope with rare minerals. I could be wrong. Can someone elaborate who knows more about this than I do?
"Ballistic conduction (ballistic transport) is the transport of electrons in a medium having negligible electrical resistivity caused by scattering. Without scattering, electrons simply obey Newton's second law of motion at non-relativistic speeds."