I think there is a divide in thought between the two main perceived groups of 40k players. In one camp, there seems to be the uber-casual players who do whatever they like and in the other there seems to be the hyper-competitive tournament scene players.
While I don't doubt that these are indeed two groups of people, I think there is a third group that many, if not most, gamers fall into and this is what I will call "typical" players. A typical player probably plays in a few tournaments or events here and there, might play at someone's house/garage/basement on occasion, but the bulk of their games are pick-up games in their local 40k community (whatever that may be).
Obviously, at a tournament or event, there are certain special rules and conditions placed on the players for whatever format is being used. But since, in my assessment, the bulk of a typical gamer's games will be pick-up ones, what is the baseline rules and conditions for those?
I would say that in my opinion, the majority of these pick-up games are standard missions out of the book, using the current edition's rules, and using units/books that are widely regarded as standard. These standards are usually pretty well aligned with the tournament scene for their area. I know that around here, we frequently will default to the way that Adepticon runs things. It isn't so much that it is important to have the absolute best rulings, or refuse to give up the right to decide for yourself, but it is important to have base-line components in the game already laid out for both players. It is this common ground that makes for a more enjoyable game. I don't know about you, but it feels off-putting to show up to a game in a place you aren't a regular to and then get into a conflict because of a local "house rule" or some other oddity that you weren't aware of because it is taken for granted by the usual players.
The point of me writing this is to try to illustrate a slightly different angle to some of the insanity that has been rocking the 40k blogosphere lately due to GW's release schedule. I think that what is at the heart of much of this chaos is that what was once "typical" 40k is much less concrete than it used to be. Obviously, tournaments can do what they like, as can players. But having standards that are widely accepted would be wonderful. And if people want to depart from those standards, at least both players are making a journey from the same starting position.
That is all.