FYI Nadjia's Dauntless Duelist DOES reapply to a new target when the marked target dies, which may be a dealbreaker for choosing it as a primary raid loadout for several classes. I'll have a Youtube video available this afternoon, illustrating my findings and thoughts from a frost mage POV.
As an off-meta Kyrian mage, I feel like Let Go of the Past might just as well not exist. Compared to other soulbind abilities mentioned in this article, the Kyrian one is laughable.
Burrs go brrrrrr
I'm probably being dense but why is it a dealbreaker that the Dauntless Duelist debuff is reapplied to a new target when the old target dies? My first thought is it's better to have it up on something than not have it up on anything?
The math shouldn't be too difficult and should just boil down to whether your base bonuses from food, flasks, and oils account for >15% of your damage. I think that's actually a pretty lofty goal, personally, but would recommend simming personally, as usual.