Why do people even complain about aftershocks on mages?

The Keystones literally is used for its defensive property, it has a 45 sec cooldown unlike the damages runes, it literally require you to stick to an opponent for the damage part.

You're complaining about it because:

• You got hit by a cc while trying to shot the mage
• You can't one shot the mage
• You can't figure out how to play around the 45 sec window opportunity
• You got outplayed.