The article should have mentioned the absurd air-quality regulations in Southern California that make it difficult or impossible to use and store the paints and solvents necessary to build aircraft.
Actually the aeronautics/aerospace regs that kicked in a few years ago(99-00?) was national in scope. 99.99% of the VOCs and particulates have to be removed from the exhaust stream.
Depending on how/when the technology matures, the body shops will eventually face the same requirements.