Gold healing doesn't create matter out of nothing, matter can't be created out of nothing, it's created out of the energy in the metalmind. Of course a cell could model itself on a cell next to it without you ending up with cancer. (cancer couldn't even survive in someone tapping that much healing) Drawing that much healing effectively puts your body into a sort of perfect stasis and whenever it's knocked out of that state it's instantly drawn back to how it was. You can't have a system of healing that's so perfect, that as long as you have enough healing stored that it will instantly heal a bullet to the face and lets you live without breathing but yet the body breaks down on a cellular level. It just doesn't make sense. The Lord Ruler knew how feruchemy worked, but didn't know about compounding and atium until the Well, and if he found out that atium was specifically for holding age then he maybe he could of overlooked the potential of gold to achieve the same result. Or as I said before the decision to use atium could of been influenced by Ruin. I do realize that this isn't how Brandon has created his world and that gold is for healing wounds and atium is for age and immortality, It just doesn't make sense to me so I have to rationalize it so that it does otherwise these little things really bug me. Gold feruchemy heals shardblade wounds? How could you know this, it's from two different worlds. I haven't watched or read any interviews from Brandon, so all I really know is what I've got from the books. Is it Brandon that's said this?