So the vaporization effect happens only when cutting non-living object, yes that's true, but by your words if you get "cut by the blade sharp tip" your soul would get cut, wouldn't it? And the blade would pass through the skin with a fuzzy effect.
I agree with you. I mean I would agree with you if it was another author, maybe Sanderson has got me spoiled with the consistency of his magic system so it kinda bugs me when I find situation where effects aren't what I expect them to be.
Still I will take your advice by heart.
On this note I was reading this passage on Oathbringer chapter 38:
What's the use of a shardhammer if you have something that cut everything?