The problem is not in manual painting only or benefit of robotics. Obviously robotics and automation make things better in quality and control but it more than that.. like the entire process.. like cleaning/ spraying the entire car with a special cleaner, then primer, electrostatic dipping, primer , base coat and the most important the clear coat.. I might have missed the entire process but giving you a general idea. The depth uniformity of clear coat is the most important as it gives shine and protection. PKDM cars has one of the worst clear coat application.