Like many people commenting on this article, I signed up for an account just to do so. I am a GNU/Linux user. I am a Macintosh user. Funny enough, I use GNU/Linux on my macintosh powerbook.
My journey with OS X was a pleasant one, although recently it ended sadly. It seems HFS+ can only survive so many system crashes, and since it seems all of the really handy network connectivity apps froze my system constantly, I found myself in the same boat as I did with NT3.51 and it's supposedly journaled filesystem -- an unbootanble system. Granted, HFS+ isn't journaled, but Apple also claims OS X doesn't crash that much. ;-) It seems I was the only mac user I know that Jaguar brought more trouble too, rather than good, but I digress.
The author of the article clearly is either trying to get someone's goat (like the OS X community) or simply doesn't actually understand what constities a UNIX system. As far as official-ness goes, certification (read: giving money) to the Open Group is the only way I know to officially call a UNIX system a UNIX system. So in that way, neither OS X or GNU/Linux is UNIX. (Heck, even NT has a POSIX layer.)
The flat files stored in /etc are not necessarily the "right" way if storing config data as well. After programming the Linux and Solaris daemons for a product for a company I worked at recently, I would have saved days (DAYS!!!!) not having to create a modular and generic enough config file parser that could tackle any of the formats found in /etc. Granted, when administrating, flat config files are great, IMHO. Readable, easy, fast. Programmatically, they are awful compared to a sytem call which works on a key-value pair.
The author's posts defending his article also confuse me. He really, really believes he isn't a troll. I have my gripes about OS X, and I believe that Linux on my powerbook is INSANELY more responsively than OS X, but wow -- reread your article a couple of times there, guy. Can't you see how it seems to most everyone that you are just trying to piss people off with your nonsensical words?
GNU/Linux is great, but it isn't "the one true way." I like it, you like it, OS X users may or may not like it, but they prefer their UNIX-like OS.