Iron Will knockback immunity is too strong and need a nerf or a rework

Title. Everything I say is based on my experience in 0-24 GS, which I find the most fun to play and where I have spent around 1000 hours maining sorc since the class appeared in the game. No idea about the HR experience.

Total knockback immunity is too much for a noob stomper 150hp movespeed stacking class that kills anyone but fighter in 2-3 hits. Total of 6 spells from a sorcerer's kit are based on movement interruption, and one single class, already being kind of a counter to casters, has immunity to 5 of them (at least the frost lighting still stuns barbs). With current magical damage nerfs it became even more of a problem.

My suggestion is either putting k/d on knockback immunity (which has been suggested here earlier) which will give you a second chance to escape, or giving some class perks an ability to overcome Iron Will (like, wind mastery on sorc males you ignore immunity or knock barb back less far than other classes).

P.s. Casting Levitation on an Iron Will barb and getting it redirected on yourself is pure cancer, get rid of it.