Who says that only the color is the distinguishing feature? And if you are thinking about colorblind people when mentioning color perception, then either let t

Who says that only the color is the distinguishing feature? And if you are thinking about colorblind people when mentioning color perception, then either let them rely on other aspects (ex: shape) or don't allow colorblind people to operate the machine. I know it is not very inclusive, but if colorblindness make it more likely for the operator to kill everyone, then it is for the best (I am mostly thinking about commercial airline pilots here). And I don't find too much color distracting. Bad use of color is, but signage often use the whole rainbow with great success. For example, metro systems all over the world assign each line a dedicated color, making for quite colorful maps, and it works, that's why they all do it.