Guardian's cooldown is way too long!

I feel like Guardian has so much potential, but in the end gets crowed out by aftershock due to its long downtime. Aftershock has half the cooldown and not only makes the wielder monstrously much tankier, but deals massive AOE burst damage. Melee supports feel like they're stuck in an arms race with the opposition and are essentially forced to take this keystone over any other due to the risk of being outmatched in lane.