You're getting into arguments over the "why not", but where is the "why"? What do you feel justifies this change? What necessitates it?
If you said "Paladins have a problem holding AoE threat, maybe this will help", okay, we're listening. But from where I stand, I think you have much better case arguing that your stun should be off the GCD.
Somewhat off-topic, with how "off the GCD" works in this game, any benefit is muted, at best...
