Frost and Necrotic Strike
Dual-wield frost can and should use it on healers - but, one, there's not a lot of us, and, two, you get people who refuse to use it because it doesn't benefit from Threat of Thessarian.
It doesn't make it not worth using (it is - these days, it can give you 2x if not 3x more value for your rune than a single Howling Blast, if you count both the hit and the total absorb value), but, uh, for some it's just the principle of the thing. They see that it doesn't get that off-hand hit, and they boycott it. Like a hunger strike.
2) Death runes dont come as easily to us as they do unholy. Yes, we start with death runes, but we have a harder time converting our frost/unholy runes into death runes.
3) A big chunk of our damage is OB burst. Spending death runes on a necrotic means we're not spending it on an obliterate.
In essence, where NS is a mainstay of unholy's rotation, it's really just utility for frost.
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