The beginning of Dragonflight DKs decline in PvP.
Nope, I said this before. This is one of the reasons Frost was MIA after Legion, in spite of it being S-tier in PvE in BFA. It was satisfying to hear Rime proc and watch it hit massive add groups but it was otherwise boring and monotonous, and tickled in PvP. I’ll never forget hitting a priest with a Killing Machine proc with every cooldown and gear buff active, and only dealing 3% of their health with an 11k total hit while they laughed in my face.
What they need to do is expand the mechanics with more primary abilities so the spec isn’t so boring, and the devs have more room to make modifications.