От тех же элитистов:
"Windfury Weapon
Please note that the mechanics for Windfury Weapon do not apply to the buff applied by Windfury Totem. This section of the article relates to the Shaman's self-buff only. If you are confused by this, please unsubscribe because I cannot make it any more clear.
Though no one is really sure how long it has existed, the 3.0 second cоoldown that is associated with Windfury Weapon was brought to light around the 2.0 release when Dual Wield became available as a talent and it became common to wield weapons with a speed faster than 3.0. Proving this is very easy -- you will never, ever receive back to back Windfury Weapon procs while autoattacking with a single weapon whose speed is less than 3.0. (Slow effects such as Ice Armor that artificially inflate your weapon speed can cause this to happen.) Blizzard has never stated a specific reason for implementing this cоoldown, though it is probable that some combination of latency and freak WF proc chains would be sufficient to kill other players far too quickly. It also acts as something of a limiter on PVE DPS, as an unlimited proc rate for Windfury would almost certainly produce unreasonably high amounts of damage."