But for people in other, "left-brained" professions, enhancing creativity is less important and engaging people is less important, so it makes sense that they would see design rules as irrelevant extra work of little value.
If you assume my work requires no creativity, or that I think design rules are irrelevant, then you are mistaken. I don't like design for the sake of design. I do like design that looks good and enhances a things intended purpose.