This shouldn’t be a story. And yet it is, still, in this world, newsworthy. As John Siracusa said on the recent episode of ATP, being gay should be about as interesting as being married. You don’t “come out” about being married, or left-handed (though I did compare left-handedness to sexual orientation in an essay once) because it’s just not that interesting or noteworthy.
The very fact that this had to be presented by Cook as a revelation shows that there’s still social progress to be made. And as Casey Newton pointed out at The Verge publicly acknowledging that you’re gay can still be a career-ending move in most of the US. Even for the CEO of Apple, this wasn’t a risk-free move, and it does make a difference for a lot of young gay people.