I've been doing some thinking about your earlier post concerning classifying horror, Neil.
There was some heated discussions concerning that subject in the 80s. Author Charles L. Grant was very vocal about it. He wrote "quiet horror", no gore, very dreamlike/nightmarish. The opposition was called "splatterpunk", pure gore.
I recommend the books "Horror: 100 Best Books" & "Horror: Another 100 Best Books" edited by Stephen Jones and Kim Newman. They explore a fair amount of horror that defies the genre boundaries. And make a strong point concerning authors refusal to have their work dubbed horror.
Personally, I like the classification "dark fiction".