You don’t use basic skills for fury on t100 as WW, you pretty much only have it for mobility or a vulnerability proc on single target (but it breaks the WW which snapshotted damage, so not often used by anyone), or you don’t even have any basic skill at all.
3-shouts are a must, both for fury generation and their buffs themselves, and then there is wotb & iron skin, both used pretty much just for the unstoppable effect. (Iron skin can last a little bit, but not for long on t100).
Which only leaves 1 skill slot if using all of that, which is for WW.
But not many play WW, because it’s a veeery slow build on t100.