Change Rune of Rage
Would Rune of Rage be better if it had an offensive proc? Sure.
But so would Hoelbrak, Pirate, Pack, Vampire…
Runes go into armor, they can take effect when your armor is struck. Sigils don’t have defensive (“when hit”) procs, Runes don’t have offensive (“on hit”) procs.
Rune of the Rata Sum. Rune of the Citadel, Rune of the Lich, and Rune of the Grove all have on hit effects actually. I think Rage needs to be added to that last, maybe lower then duration of the fury but it offers nothing but critical damage so it would be a great change to have it activate on attack.