The more you stay the more you get to know these rules

That's true, but isn't that bad from the perspective of new users? I know that there are people who want to cheat from the very beginning, but there are genuine people who don't know those "unwritten" rules... And when they got bashed with a hammer, it can be painful and demotivating to continue and to "learn" the rest of the rules...

Even in places where no one governs, you'll realized that these are the places with the most enforced rules that don't seem obvious on the surface.

I 100% agree with this! I don't like to have many rules, but I do like to have clear and simple ones!