this is where your lack of experience lets you down. You don’t seem to understand the encounters and how that makes frost seem better than it is by glancing at the warcraft logs.
Currently, kyrian Obliteration is top performing sim in ST for fDK…but as you would have noticed all top logs are BoS. With the exception of maybe The Nine, all the cleave damage is just pad. Some people argue its not pad if the adds needs to die in a certain time but in most cases the raid’s natural cleave will easily take care of them so I don’t see add focused damage as super important.
I know you love tooltips, so I’m sure you noticed BoS is very heavily weighted towards aoe/cleave. So when you breakdown the pad vs priority damage, its bulk damage is sitting in the pad where as other classes can still pad like fDK, most of the damage is sitting in the priority damage. So frost DKs look better than they are in the logs because they can Pad REALLY well, better than most classes. Its also why BoS has been pretty successful in m+, but its lack of other utility means other classes are picked for MDI level comps.
Obliteration is pretty mediocre at aoe/cleave…so it doesn’t get the benefit of super padding its parses. So its left behind being pretty average.
So to answer your question, what would performing decently mean? being within 5% of top performing class’ priority damage. And if Obliteration cant compete with BoS for cleave/aoe, it needs much more ST output to compensate.