The moment you start writing them down people treat them as rules and they become definitive.
Furthermore the 'community' doesn't cover everyone on Hive as some have differences of opinion over where to draw the line on these behaviours. Take "quality content" or posting multiple times a day, how do you define what's acceptable or not?
I'd say for newbies, it's all down to observation. That's the easiest way for them to understand where the line is.