If you want to get into the semantics of chance vs. randomness,
there is an authority on that topic. Chance and randomness virtually mean the same thing.
You need to get outside and cool down for a bit, Hiver. In the context of the OP, it doesn't matter at all whether or not this game relies on RNG or not (it does). Every post that deals with RNG only veers this topic even further off-course.
The solutions to the armour issue so far still don't fix the "burn down and CC" issue. Either the armour needs a serious re-work (if it's to remain anything similar to what it currently is), or the CC needs a serious rework, or better yet, both need a rework.
The end goal is to have a system where CC isn't basically the only valid method of winning fights. We can do this by following several methods: remove variety (dumb down armor and CC), add more variety (more ways to bypass armor values, more ways to specifically defend against CC) or a balance of these. I think we should add more variety. This means more skills like Marksman's Fang which directly bypass armor, more skills like Armour of Frost which allow you to cut off a CC effect.
For armor to work (regardless of whether it block damage or not), there has to be a way to recover it even while being already CCed. And there is: perseverance or having allies support you.
The only issue that will remain is AoE CC. It is way too strong.
Countered by party positioning, at least partially. Maybe a new talent that allows you to get freed from CC once during a fight?
