Unchained...nothing stays the same (but how do YOU use it?)

[Launched]

as no Warrior will ever be MTing a raid, progression or otherwise

So? Were you in Savage on release? Because no WAR was doing 100% Deliverance uptime then. You have an Oppressor to tank in A1S, double dolls and a few other groups in A2S, you spend half of the last phase of A3S tanking, and Straf Dolls in A4S. There are plenty of times for a WAR to use Defiance, especially when undergeared and learning a fight.