From what I understand, based on forums, Discord and Ask Mr. Robot, the legendary helm is still one of the best legendaries and certainly better than Kil'Jaeden's Burning Wish. My question then is why does my bracer's + KJBW sim higher than bracers + helm, yet AMR tells me to go with helm.
Here are the sims in both my gearsets. The second one is what AMR suggests. Both are Patchwerk. Even AMR's sims show the Bracer+KJBW as being higher.
My guess would be because you're replacing the legendary trinket with DoS. Frost DKs are not warriors. Pretty sure even a normal mode convergence would be better.