Kokoro is still good in this game. The only legitimate nerf would be her damage output, which is to be expected. Things simply just changed. You can't punish the 6P+K at -8 because you have to respect followups. You can't punish 2K at -15 because you have to respect followups.
She may have lost being able to stun with 33P and 6P+K. But, I think you guys have missed 236P+K > P. That string is good; it has Heichu, a good stun starter and extender, just as fast as 33P and 6P+K (i18), and is -4 on block. The new sabaki is amazing too; easy timing with a threshold stun. 3K4K being slowed down doesn't matter much either. She has mixups on all 3 levels. It's not like you're going to be abusing 3K4K a lot anyway. The bounds offer 66P+K, which gives a good amount of damage. Of course it's not the same as her SDS damage, but that ties into the damage output nerf. Options from Heichu aren't that bad either. They could be better, but they're no where near being sucky.
Stop complaining and pulling out the nerf card. Kokoro's still strong, she just changed. Just Adapt.