I too am unsure where it would fit in the general tree but there would be ways to make it work. Originally they removed it because “frost and fire is bad” but now they seem to be going back to actually letting specs use other spells (plus its not like we dont have arc-frost, shadow-frost, arc-fire etc).
Conceptually it was replaced with Flurry which imo isn’t that great. I’d love to have it worked back in as a replacement of Flurry so it still procs off BF but doesn’t apply Winters Chill (but hits much harder). Could easily keep it in the general tree and just have Frost talents that buff it.