This entire discussion boils down to two statements: There most certainly are guidelines for Literati style, and: What are those guidelines?
When the word guidelines is incorporated into a discussion it is usually followed with a "list" of things, principles, methods, and treatments. Without this set of guidelines there are no---guidelines. We are making an argument over perception not execution. You cannot refer to images and say that these images are guidelines, that's a lot of whooey, it may be all the evidence we have and it may be the model we are driven by but it is not a guideline it is simply a form to be imitated.
A guideline provides for a clear cut definition of a particular subject, where by someone having never seen a Literati can create one. As is stands at this moment it is beginning to sound more like a Congressional hearing trying to define what pornography is. This actually happened; in one of the debates over this subject(pornography) some twenty-years ago when some member of Congress made the statement: "Well I can't define what pornography is, but I know it when I see it." It makes one wonder if viewing a lot of said material was mandatory in making that determination? What a world, what a country, what a mess.
In the end it all comes down to a subjective analysis lacking any method of making an objective one.
If you cannot provide clear cut guidelines just say so, there is no fault in that; from what I have found after going through all of my library of some forty-years in building, no one can. To me it is foolish to continue arguing a point that you cannot prove rather than to admit being wrong, when in the end you will still be proven wrong.
Maybe it would be better for all of us to determine what the style is to us and how we define it. God knows no one else can, or has. Sometimes we look to other sources greater than ourselves for justification of our actions when in reality we have gone beyond or outside of those sources where we are now required to provide the "guidelines". Do you think the Wright Brothers had to quote other sources concerning powered flight before they were able to make the first powered airplane?
Sometimes you follow a trail and sometimes other people expect you to blaze one, and sometimes circumstances put you into a position where you have to.