Put it this way, if the ai article is indeed so good, why store the article in a dusty long form output mode from a soon to be obsolete model? Just give us the prompt, and in 6 months with some newer, bigger, better model, we can feed that prompt and get an even better article out of it.
to play devils advocate - i doubt the articles that end up on the front page are one shotted (theres probably a sequence of back and forward refinement). and in any case, i feel the avg reader would actually not prefer to read the prompt, which would be very information dense
having said that, i'd still much prefer a norm of including prompt history with the article, or the codebase for that matter, so people can choose for themselves :)
The fallacy here is that you can't reduce the wide range of things that “AI generated” means into a single flag. As for why not “show us the prompt”: https://sgnt.ai/p/prompt-is-not-the-work/
A lot of my PRs are the result of hours of back and forth between an AI and myself. In many cases the sum total of my prompts is much larger than the final output.