Because the people who worked on it decades ago aren't making daily decisions about their careers any more. Young people are, and it would be really dumb to recruit people to solve the real and hard problems of improving this technology from only like 25% of the population.

> I am, somehow, less interested in the weight and convolutions of Einstein's brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops. --Stephen Jay Gould