no her old passive was also pretty shitty, that's why they changed it
the thing about hr new passive is that it's good conceptually, but the combination of;
really low numbers (five stacks of 2% armor/mr reduction on a character with, let's say, 30 armor/mr, will reduce it by 3 - on a character with 200 armor/mr, it will reduce it by 20)
a really bad bug (it currently only affects base armor and mr)
makes it patently useless in every single situation