I'd guess it depends quite a bit on the kind of horror culture that was always strongly linked to physical media from VHS rentals onwards and indeed the interest is often about that culture so people like to have the extras detailing it, less luvie fest(that generally doesn't tell you much beyond what was onscreen anyway) more Rob Bottin like "how I made that exploding head" details.
When it comes to HD releases quality as well its not really uniform, a lot of earlier BR releases tended to use the same scan source as previous DVD's which was generally done at HD but often not amazingly well because it was going to be downscaled. In more recent years a lot of BR releases come from downscaled 2k or 4k sources downscaled to HD and these tend to look a lot better and hold up better on a 4K display.
The jump from a badly done BR to a well done one can be as significant as from BR to UHD BR, sometimes moreso.