Well, I used to be part of a darkroom where people would create their own films and plates, and you learn that manufacturing physical objects is relatively easy now, but manufacturing film chemistry at a consistent level is bloody difficult. Physical build monitoring is straightforward, but feedback cycles with chemical and pollution monitoring isn't. The level of consistency is mind-blowing for motion picture and still film. Any idiot can make bulk craft beer (and indeed does) but few idiots can make a delicate lager with little headroom for error.