Good on Tim Cook for coming out publicly.
People who have never had to come out or face homophobic bigotry and harassment will at this point be saying “why is this even necessary?” because they are too blithely unaware of history to know why it is necessary. For a whole lot of young gay people interested in technology and wanting to work in the tech industry (etc.), this is something that will help. I don’t just think this, I know this from direct experience.