CoI in frost snares the FC and as unholy you cant. I find it easier to snare and keep a FC still as frost then I do as Unholy.
If only Blizz didn't take away our desecration.
Chillblains is a talent. And i bet(100% sure) if the icy touch QoL with reaping goes live, most unholy dks will take chillblains too, having acess to a root too. At least in arenas and duels they will be very powerful again, and useful in rbgs, though howling blast is a big advantage on a flag and quicker burst switches among targets. But honestly said, i find arena much funer than rbgs and play rbgs just for points and titles. I also like to use frost in pve. I think there is room for a lot of diversity. Just a bit sad about blood. wished they would use the same system that ferals have on live: blood dd and blood tank spec. It was like that for about 3 seasons. Not that i used blood in arenas in s5-s8, but i liked it in bgs and duelling melees.(look at the old def talents of dd blood spec) also liked the idea to regenerate life by hurting others like a vampire, there could be more design into this direction, make another spec useful in pvp too and fun.(just beeing fc sucks imho)