Blind also has a CD, Sap requires the target to be out of combat, Hex allows the CC’d target to move freely, and poly and rep, as well as the other aforementioned CC’s all break INSTANTLY upon damage.
Fears do not break instantly on damage, there is a damage threshold that must be surpassed before the CC is broken. Not to mention like was stated previously, Warrior fear and Priest fear are both AoE, and Lock fear is spammable.
You are comparing apples to oranges.