User blog comment:RoznosicielCiast/Why Sejuani is getting reworked?/@comment-5266525-20130214185230

From what I can remember of Meddler's posts, it is because, for a tank, lacks innate tankiness, making her gameplay design somewhat illogical.

I mean, look at other tanks - has a massive health steroid and grows so large he can start absorbing every skillshot ever,  has a lot of damage reduction passively off his,  has teamwide damage reduction from his ultimate,  has his built-in shield which scales off all of his defensive stats, and  and  both have armor steroids. is probably the only champion you could argue is a tank and yet does not have defensive steroids. Even most bruisers have more steroids than her.

There's also the issue that, while lots of slows are nice, they aren't all that useful in. What good are your slows when an angry is just unstoppably pounding her way towards your carry with her  ?