A Different Kind of Diversity

I've been reading a lot of job requisitions lately. I've noticed they tend to be narrowly focused. The educational background is limited to a narrow range of related degrees and experience. This being the United States - that last statement is always "this company is an equal opportunity employer and hires with out regard to" followed by the list of protected classes. Companies need diversity of out look to make good decisions. They need people with diverse experiences who can bring in different ways of looking at things. Diversity matters - it helps uncover blind spots in the way people view the world. Differences in religion, ethnic background, and region can be a proxy for differences in worldview. So is education and experience. My impression is back in 1950's and 60s, there was a different kind of diversity in play. I read somewhere, back in the sixties NASA was in many ways more divers than it is now. NASA is currently a very diverse place in terms of protected classes, but for the most part all the employees went to the same schools and received the same degrees. It is self selecting for a certain type of worldview. Twenty years ago, I knew corporate managers who had Fine Arts degrees, English degrees, and History degrees. In this day and age, you could get a job as a store clerk, not as a corporate manager. These days, you need a business degree. And that poses a problem. If everyone of your managers has the same education, the same type of personality, the same worldview - how can they expose blind spots in the corporate plans? How can they create the contingency plans that ensure success? Does it really matter if they all look different, but they all think the same?