Age of Sigmar is definitely NOT forbidden. The sour grapes are mostly because the Warhamsters used to be a WHFB club before expanding into other games, and the End Times saw GW replacing a beloved game into which folks had sunk a ton of money, time, and talent with a game that, while it might be great in its own right, was definitely not WHFB. In that way, Age of Sigmar is a reminder of what we once had. Also, it gives old farts a chance to grumble about kids these days.