Why does racial and gender diversity matter in tech? I have worked in teams of all white guys and teams of mixed race and gender and I have seen no difference i

Why does racial and gender diversity matter in tech? I have worked in teams of all white guys and teams of mixed race and gender and I have seen no difference in productivity. The only thing that ever mattered was the skill level of the people. I see nobody complaining that most successful basketball players are tall black people. I don't see a problem with having companies with corporate culture and companies with startup culture side by side, just because I dislike the suite and tie culture doesn't mean I want it gone, however from reading the article I get the impression that the author wants the more liberal companies gone just because he doesn't like them.