I think armor should just prevent the hard CC but not the soft CC. In other words it would prevent burning but not warm, frozen but not chilled, stunned but not shocked. There could be a few other soft debuffs thrown in for other kinds of CC.
And since an enemy is debuffed before his armor goes down the CC would effect him as soon as an appropriate spell broke through the armor. Like an opponent is chilled and becomes frozen once another frost spell breaks through the armor.
The softer debuffs from spells are good in and of themselves most of the time. They debuff resistances and other things, which would make it easier to damage with other spells to take down the armor faster.
Last edited by rickbuzz; 18/09/17 11:11 PM.