Why would they make KM work with Obliterate only, why not Frost Strike instead? I mean Obliterate hardly hits for anything noteworthy. We use it because it gives us runic power and Rime.
I don't understand why they would give us a passive effect that makes our weakest damaging skill auto-crit. It would have made a whole lot more sense if it only worked with Frost Strike, which clearly is our hardest-hitting ability.
It feel a lot better with Frostschyte though. Still, it makes no sense having a passive skill only working well if you pick a particular talent.
Obliteratation is also very weak without Frostschyte.