After getting dark knight 60 and playing it for a while

[Reynhart]

Ifrit for example will be untargetable multiple times in the fight, soul eater/bloodbath/IB/Path is automatically discredited at these times where as Second Wind/Thrill/Equilibrium/Clemency are available or running out their clock during this Downtime.

Again, not relevant in any real situation since you'll have a healer by your side who will keep eveybody up with a single spell.

It's exactly like the "Shield Oath/Grit is better than Defiance because the healing boost is only 20%". Yes, in theory, it's true, but in practice, both are the same.

And you also didn't take into account Abyssal Drain too, which is marvelous for fight with multiple targets.