You're also missing that 0.1% is still better than 0%.
And specific cc protection is a thing.
And you completely ignore the part about my Earthquake ccing MULTIPLE targets in the suggested system while the current one will only work on the chosen focused target. RNG dice roll on AoE breaks the game even more than focus-fire CC while being nowhere near tactical as moves become "Fire-and-forget".
Why even ask me to bring up the flaw if the whole thing is going to be brickwall'd.