Aurora
Sage
^^Actually, Best Served Cold by Joe Abercrombie has fascinating flashbacks. It truly works in that story and gave it a richer context.
It depends on the type of storyteller you want to be and your audience. Does infodumping add to your story? Or does it slow the narrative? If it slows the narrative why is it there? Story forward is the goal. As for the bolded bit in your post, I absolutely agree that infodumping (although for me in general) is the sign of a writer struggling with story. Nothing negative, just that they're still growing in their craft.
As a side note, I do enjoy prologues and most often read them. Rarely do I find that they don't belong there. Honestly, I don't care. If the author wants it there, then I'll read it. I do not hate prologues. I do, however, find that when a reader opens an ebook on Kindle it automatically opens to Chapter 1, missing the prologue or anything before it entirely. This is a discussion I've had with author friends in recent times. There's a way to switch it so the story opens to the prologue or acknowledgement but readers don't seem to want to read anything before Chapter 1. It makes me sad because I enjoy putting poetry and a monster legend at the beginning of my books.
1 - Movies are a very different format than text. What works in a movie will likely flop in a book.
2 - Disney movies are hugely successful.
I suppose my meaning is that sometimes infodumps serve the story better than scattering bits of important info like breadcrumbs. Over-reluctance to infodump can sometimes lead to a very long and drawn-out relief to a case of the where-the-heck-are-we's. Sometimes it's better to just get the important stuff out of the way rather than spread it through the narrative. Not always or most of the time, but sometimes.
Although in hindsight, I wasn't dripping fast enough and it left confusion for her reading the book so other readers would've been worse off in many cases, LOL.
Why would the world/setting as a character need a prologue any more than any other character?
It doesn't, and that's the problem. Characters don't need extensive, four-page info-dumpy backstories, and neither does the world. The prologue is just the world's introductory scene; it tells us about the world, as a character, at the beginning of the book. Nothing more.
In Romeo and Juliet, Act 1 Scene 1 starts with some random Montagues and Capulets encountering each other on the street, a fight brews, Romeo's and Juliet's parents join the squabble, until the Prince arrives. Then all leave except Romeo's parents and Benvolio, his friend. They ask Benvolio where Romeo is, Benvolio's seen him but as usual lately Romeo's been moping about and not wanting company. But Romeo appears, and Benvolio tells the parents to leave, so he can talk to Romeo friend-to-friend to see what's up. Romeo goes on and on about Rosaline, and love, and his despair. Romeo doesn't meet Juliet until the fifth and final scene in the first act; the second act starts with him outside the wall to the garden, and the two don't have that famous scene in the garden until the second scene of Act 2. So there's a lot of setup as the characters and world are introduced. The prologue gives the viewer context for these by introducing the conflict and the fact that this is a tragic romance that's about to be told.
Imagine without the prologue, walking in to the play with no knowledge of it: The families' brawling, the wondering where Romeo is (not involved in the brawling), his introduction talking about some lost love...The viewer might think this is going to be a play about street warfare between these two families and, until Juliet is introduced, wondering how Romeo's going to figure heavily in that battle! With the prologue, the viewer can interpret what's happening until Romeo and Juliet meet at the end of the act (will have the context) and may be waiting a bit on the edge of the seat to see how that romance will start amidst such conflict.
So this for me is just a general example of how such a prologue might be useful. I suspect Demesnedenoir's story might have required that kind of drip-drip of characters, milieu, etc., in the first chapters, and his editor thought an intro to the story was required for this reason.
I'd still say keep such an intro short and sweet. Plus, it doesn't hurt to have some personality behind that intro, someone speaking it, heh. The R&J intro is a chorus intro (outside narrator), and D's has a first person speaker (that may or may not be speaking to the reader...at first!) This gives the feeling of importance; such a speaker must feel the info is important enough to tell. I've been thinking of doing something similar with my WIP, but in the form of an excerpt of a letter written about five years after the events of the book, from and to individuals who didn't actually participate in the events.
The analogy is stronger the more the two things being compared are similar, at least with respect to the characteristic being analogized. I think they're quite different here. In a play, you lack all of the tools a novel writer has to get this information, effectively, into the story proper. If you don't have the chorus give this background information, then what? You'd be stuck with some lame dialogue between two characters telling each other what they should already know. With a play, which is meant to be seen on stage, you have a more limited tool set to work with. This is, to me, to most effective way to set the stage (so to speak) in a play format, whereas if Romeo and Juliet were being written for the first time as a novel there would be no reason to do this. You could very easily convey this limited amount of background information within the very first scene, where Benvolio, Tybalt, and the random nobodies are fighting.
Well, no, you do have the option to introduce this early in a play. Just have Romeo and Juliet meet in the first scene, have attraction, and, like the scene at the ball, the eventual realization that OMG they're from two warring families. You could maybe even have family members show up, interrupting them, and a brawl breaking out, until the Prince arrives. And the "Wherefore art thou romeo?" spoken at the end as the sides are being split up.
Sure, you could always restructure the play or change your mind about whether the viewer needs the information. But if you want to stick with this opening and want the reader to have information upfront, options are more limited than with a novel. If one were writing this as a novel, there would be no reason for a prologue.
The only good argument for a prologue I've really heard is "I'm the author and this is a stylistic choice I'm making." Ok. Perfectly valid. Follow your vision for the work. Why not acknowledge it as what it is--a choice among stylistic possibilities. Everything beyond that seems to be an attempt to rationalize the choice. I see a lot of "I need a prologue" from new writers. No, you don't. Doesn't mean you can't have one, but if you think it is necessary you* don't understand the other options.
*Generic "you," not any specific person in this thread or elsewhere.