Because you didn't read, you missed the entire point of the article, which directly addresses your comment.
Well, now that I did and I want my 10 minutes back. I disagree though with you there about this article dirctly addressing my comment. It directly addresses a strawman argument the author pulls out of air in the beginning. I think everyone agrees that Linux supports more hardware and OSX supports less. And by doing this they can support in a better way. Don't you?