It's not quite so magical once you've experienced it repeatedly.
Fairly often, a particular post will trigger the dreaded 404, sometimes even resulting in a temporary lockout from the site (which usually lasts about an hour).
And often, when one post under one heading will trigger a 404, another post under another heading or topic will work just fine.
The more you post longer, more detailed content, the more likely you are to get a 404.