[2023] Can somebody please explain the Debilitating Shout node from War Cry to me please?

This node is written very poorly. I get that when you use it it immediately applies a 2 sec per point stack of frailty to all targets. But what about the Frailty on Hit bit? Is it that you apply Frailty on Hit for the 2s/point duration of the first frailty stack initially applied by the activation of War Cry? Also anybody have thoughts about the usefulness of this node? Seems like it could be very useful for bosses in monoliths to me, because making the enemy do less damage is definitely a good thing. Seems like 3 points with enough attack speed would be enough to give the target 3 stacks for all but about 1 second if you hit your CD on time.