You could argue that Plaguebringer and DnD Cleave are more important to track than Icy Talons (which is tracked).
Yes, I can achieve these things with addons but after seeing Pillar of Frost being tracked now, why stop there?
Other notable mentions are in my opinion:
Dark Transformation( to know how long time you have left to use Big Gnaw and Big Leap).
Death’s Advance ( to know how long time you have left to be immune to knockbacks).
There are a lot more spells that you could add to this list but I’m trying to only give the bare minimum to not overwhelm new players.