Originally Posted by
Imnick
The new guides are recommending FoA because they are written assuming that you are weren't mailed all of the pieces of the nighthold tier set as soon as you logged in.
FoA is the best talent before you get the 4 set. After you get the 4 set, it is viable to take Boulderfist and drop FoA.
But you have to get the 4 set first.
FoA has gained value because it was buffed, and because LL was buffed. The buff to LL means that it pushes CL out of the rotation, meaning that we wouldn't use it to trigger CS, with any talent combination. You take CS with Boulderfist because you cast CL like six times in a fight to trigger Alpha Wolf, and that's more DPS than the 0 DPS from the other two talents.
(This is talking single target of course, for multiple targets you still cast CL).
Earthen Spike and Sundering just aren't viable right now. They don't do enough damage.
This is also mentioned in the wowhead guide.