One thing I like about this list is that it's so focused on the audience. Van Dine's priority is being fair to the reader and giving the reader an enjoyable exp

One thing I like about this list is that it's so focused on the audience. Van Dine's priority is being fair to the reader and giving the reader an enjoyable experience and most importantly making sure the reader gets exactly what they came for when they pick up a mystery novel. Although modern writers would likely find a list like this too narrow, I think the base point of being fair to the reader is a good one. It's one that, as many others have pointed out in this thread, many mystery stories today would benefit from.