Seems like one of the easiest solutions to fixing the CC issues in high level NM (other than adjusting certain affixes) would be adding a CC break and short unstoppable to evade.
Every class has evade and I know I’m already usually mashing evade and potion when a CC kicks in. I feel like the game would feel more responsive if you could break yourself out of CC reliably with evade. This wouldn’t completely fix the unstoppable imbalance between classes, but would be a good change alongside any nerfs to perma-unstoppable.