Safe borders Immunity to CC broken?

I am not sure if it is broken or works as intended but under my understanding Immunity to Control should also be effective against Wizard’s arcane wind that slows you and pulls you to the centre or Barbarians chains that pull you, however when I use Flowing strike with safe borders it seems like I can’t be frozen or immobilised but I can not escape Barbarian chains or Wizard arcane wind, which makes me ask, what’s the point of the immunity to control if they still easily control me?