Listening to a podcast interview with Kenneth Hite(Trail of Cthulhu, Night’s Black Agents, The Fall of Delta Green, GURPS Horror 3e)
Horror is about player emotion at the table. If all the players are not willing to bring emotion to the table Horror doesn’t work. Think we have talked around this a bit but he seemed to sum it up succinctly. Also part of why Ravenloft and the Domains of Dread doesn’t really work, people are playing DnD not Horror.
Second one was to read masterpieces of the hobby. In context he suggests Masks of Nyarlathotep as a masterpiece of sandbox.