Currently, no, you have a chance to resist CC even with broken armor, but it's pretty low if not 0% if you don't invest in constitution and perseverance. I could make hard CC like stun and fear ignored by this system and apply 100% of the time, but I want to avoid that kind of inconsistency if I can. I'm not sure I see 100% vulnerability to CC without armor as a benefit, since it turns the game into pretty much you're dead without armor. But I also think armor should definitely be a majority of the defense against CC, except perhaps for a tank character.
Another thing I was thinking of was factoring character health into resists. Say, at a ratio of 2% missing max health is 1% less chance to resist. So at 50% health, you'd be 25% less likely to resist statuses. Then you wouldn't worry much about a character with 20% health remaining resisting a stun. It would also make piercing damage more useful, and add a certain kind of synergy to different damage types, where even a character with high magic armor would be less resistant to magic effects if a physical damager brought their health down low.
