On that note, the game needs a way to see CC immunity/reductions. I would propose:
* New debuff icon (not buff!), same basic shape/icon as the actual CC.
* Blue or green background instead of red.
* Duration is always 15s from last CC expiring.
* For CC where the reduction increases in intensity, it has 1-3 stacks. For immediately-immune CCs like my stun idea above, it just has a single stack, no number at all.
* Basically you can never have the red and the blue icon at the same time, and it keeps the location in the debuff row. On the red icon (the actual CC) dropping, it gets replaced with the corresponding blue icon, and if you re-apply the CC, it replaces the blue icon again before on dropping that one comes back with another stack.