It's truly a unique problem in an expansion that everyone needs more non-damaging buttons to press we need more damaging buttons to press
Supernova is still undertuned just as it was the entire legion, while Arcane Orb is a decent talent that's stuck next to Overpowered which is ofc completely overpowered...
if making them baseline is out of the question at the very least make them viable, both Supernova and Arcane Orb are such cool skills (especially the orb feels so dynamic) but instead we're forced into passives
at least for Supernova the fix is obvious: buff the primary target damage to Ice Nova levels (Ice Nova does so much more dmg and is still worse than both Chilled to the Bone and Lonely Winter)
ps: how did the most obvious and awsome shameless copycat from diablo got lost? why doesn't Arcane have Disintegrate yet? arcane deathbeams anyone?...