I think that pbe changes are like two steps backwards.
As i see it, one of the biggest issues with balanceing fighter's on the past(and still) was/is keeping their 1v1 in check without giving them pathetic teamfights(
), and one of the main reasons for why fighters suck in teamfights is that they get fucked really hard by all the cc flying around as they are melee and have sustained damage patterns rather than raw burst.
Irelia's passive was for me a rather good atempt on giving a fighter better cards in a teamfight without really impacting the 1v1 scenario, with actuallly good succes. Her kit might overall have many flaws(or to little^^), but her passive imo is non of them.
Usually what breakes fighter type champs when they get op is that they start to deal to much frontloaded damage, so they actually develop assasin patterns with high burst rather than relying on sustained dps, which currently is refflectd by her yomuu's+Duskblade builts.
If those changes come through, she will just get lean more towards the usuall binary fighter patterns of destroying 1v1 and useing that snowball to get enough damage for asassin patterns(or getting really tanky while haveing enough damage to kill quickly), or not destroying 1v1 and beeing bad in teamfights.
I think nerfing her passive goes into the entierly wrong direction.
What she needs is a nerf to her burst(with MAYBE a compensation survivabillity or dps).
Either her Q needs to get the last buff reverted, it wasn't warranted anyway, or her ult needs to loose some damage(and maybe get the healing disjointed from the damage done, similar to renektons Q)