Firstly, I meant to type "Halogaf doesn't play Halo 4" which is an important distinction. Secondly, re-read the second sentence of my post. 'Multiple posters in the thread playing the latest Halo on a frequent basis' is an allusion to a time when the vast bulk of the community thread actively played the current Halo game ala the Halo 3 thread (which, upon recent reinspection, had a lot of back and forth on the minutiae of said Halo game). Of course people who post on gaf play Halo 4 but if you look at that Halo 3 thread, I don't think there's a single poster there who wasn't actually playing Halo 3 on a regular basis. I'm aware that many of the people who occasionally post in this thread play Halo - yourself, Cyclone, Jazzy, Nockz, three legged goat, Havok and more - but there are an equal amount if not more who do not play Halo 4 or play so infrequently that they don't have much to say about it beyond the obvious stuff that was called out when it was first revealed in GI. To think that I was belittling yours and newer members contributions as irrelevant missed the point of the post. Whatever you think about the old guard of this thread you cannot deny it misses posters such as Ghaleon, Dax and the insights of remaining posters when they're actually playing the game on the regular.
As Bigshow said, it ultimately comes down to the pull of the latest Halo game to bind the community and galvinise discussion. The worst thing about post-release Halo 4 criticism (and I'm as guilty of this as anyone) is that it is centered on elements of the game that were singled out as bad ideas here before anyone had even played the game. Instant respawn, ordnance, random weapon drops, flinch etc. That's why I think the Halo community as a whole (not just gaf) will go in circles until a new one is announced.