
I am on the editorial team for a decently sized magazine and the way we think about it has very little to do with the grammatical structure—almost all good pieces of writing have a complex and specific grammatical voice! Punctuation-wise, it is all about what it is doing with it and why.
I am a huge syntax nerd and will not try to go on a crazy diatribe here but could go on for days! I attached the beginning of the opening sentence of the novella Agapē Agape (which is considered [mostly] good). This book creates its own grammar rules by throwing the reader straight in. They are forced to realize that a comma here functions as a full-ish stop. This is a kind of writing AI would never think of. When I am reading I always ask myself what is the internal logic for an em dash…
…and obviously it won’t be as extreme, usually. An AI model is predictive but will draw on all kinds of usages. Is the author using a semicolon to chain thoughts with the same subject? To make full-sentence lists? The balance is such a crucial part of it, because an AI model will almost always use it to balance (not this; this) (this; this) because it can’t think ahead.
Since I don’t use em dashes or parentheses, I often reassign their function to conjunctions or semicolons. Interestingly, the person who accused me of using AI acknowledged that my dialogue was 100% not AI written, but that they believed the narration was, because that makes sense somehow💀