Thornmail can't have it both ways

It can't be a colossal fuck you to AD auto attackers and be an item punishes them for focusing you by killing themselves WHILE also applying grevious wounds. It has to be one of the other and I'd argue the former was extremely unhealthy any time it was decent.

I don't like grevious wounds on an armor item anyway because armor stacking already greatly reduces lifesteals effectiveness. Why does it have to reduce healing from all sources? That seems like it has to be in such a state that it's either broken when good or trash when not even slightly good. That was the same problem with old thornmail. What it's designed to do simply isn't healthy. Healing isn't just essential to ADCs, it's pretty essential to several champions in various classes and many of them do weave auto attacks in between their spells.

Lastly, lifesteal wasn't a problem. Draven, Fiora and warlords was a problem. Why don't we just nerf warlords, Draven and Fiora (she did get nerfed) instead of introducing a pretty shitty concept that was never explored in the previous 7 years of league despite this being a suggestion because everyone who understood it's ramifications realized it was a shitty idea.