The cc forums have already tackled the idea of changing defenses. It's not practical. Changing CC needs to be the priority. Having every different cc boil down to the same effect is toxic for game design. It just results in every move being a stun with a different name.
The goal needs to be changing the cc to something that isn't a stun. Freezing could be a snare that prevents movement or gives the character a shield that absorbs both damage types and they remain stunned until it breaks, but would also lose a percentage of the shield each time their turn starts. Blind should set hit chance to 50% or lower.
We need changes like this. A new armor system is fine by me, because it makes sense. As a battle rages, armor is going to become damaged and less effective. If anything, I hope this new system stays.