I’m honestly not sure why you’re defending dauntless duelist so much. From the tooltip I assume it can only be applied once per combat to the first mob you attack. Which makes it have reduced potency in fights with multiple mobs. Those fights being
All M+ besides bosses
Huntsmen
Kael
Blood Council
Inerva, but only a little bit
General’s
Regardless of Dauntless Duelist coming out or not, I just can’t see it being the best choice for ALL content like you seem to infer it is. I’ve looked all over trying to figure out where on wowhead or IV you found this information and I’ve come up with nothing.
Still, I’m not 100% sure of how Dauntless Duelist works so if I’m wrong feel free to call me out on it.