As I see it, down-voting is an expression of the community posture, rules are an expression of the "space" posture. It's up to the space to determine if there is something relevant enough to include it in the rules.
And again, as I see it, community should also have a way to at least suggest modifications of the rules.
I agree with you in "People who can't take a hint aren't going to read the rules". But as they say: "Ignorance of the law does not exempt one from compliance."
I tend to dislike these type of posts but a properly designed and functioning vote mechanism should take care of it.
If not, it is the voting mechanism that should be tuned - not new rules.
Can't find the link right now (cause why would i save a thread like that..) but I've seen more than once situations where people get defensive of others that post AI slop comments. Both times it was people in YC companies that have personal interest related to AI. Both times it looked like a person defending sockpuppets.
A lot of the guidelines are about avoiding comments that aren’t interesting. A copy/paste from an LLM isn’t interesting.