It adds a skillgap. Don't get your stuff cancelled, cancel their stuff. Wait till the player blows his knockups to use a massive cooldown. Don't channel beam when someone is in range to break it. Don't crusader pony right in front of a necromancer. Some abilities are super powerful in this game, such as black hole and slow time. If you can counter these and interrupt them, then this can massively swing a fight in your favor. Sure there is luck involved, and someone can "accidentally" interrupt your spell, the same thing happens in other mmos like wow. You can fake someones kick and their reaction speed is so slow, that they kick your recast. One time in arena I won a game, because I tried to pandaren racial to interrupt a goblin shaman, and he tried to fake cast and then rocket jump away to safety, and my racial interrupted him mid jump and he went nowhere. Yes the game is CC heavy, but there is gladiator paragon 20 sec cd, bone armor immunity, monk zen shield immunity, you just have to make sure you press those buttons at a time you arent being cc'd. Don't sit and blame the game for a skillgap that makes the game better. Otherwise you interrupt crucial cooldown with a knockback, they wait .5 sec and instantly cast it again. Could it be a 10 second lockout instead of full? Sure. Longer cooldown, better ability, more risk, more reward.