Clayne, there was no process economy considered. E6 and Kodachrome both wowed editors because they gave a visible image, but no one knew how to view a negative and so in magazine work and other similar types of work, reversal held sway but with real production, C41 or ECN (Eastman Color Negative) dominated and it was due to QUALITY. As RPC says, there were the factors that dominated the industries that mattered.