Originally Posted by
Archimtiros
That's not true. Fury is cyclic, so unless you somehow manage to go beyond 100% Haste, you'll always have a 3 GCD rotation (with Inner Rage):
BT - RB - Free GCD - BT...
That free GCD will always be either Furious Slash, or one of the various fillers (Whirlwind, Dragon Roar, Ayala, Rampage). Of the four, only Rampage is used consistently, but it's also used as needed rather than strictly during the free GCD, so it's just as likely you'll use it in place of BT, pushing back the whole rotation and still requiring the use of Furious Slash.
Also consider that the 2p is actually pretty good for Fury, because it finally buffs the Taste for Blood buff to the point of usefulness.
TLDR: Furious Slash doesn't get used as much as other abilities, but you're always going to use it in some fashion.