Figuring out how to document stuff for others forces you to think things through at a deeper level yourself, and that’s the main point of the idea being presented here. Forcing yourself to organize your own thoughts is where the personal growth comes from.

I don't think it defeats the purpose. Your audience will find you. Once that happens, you will start getting feedback, and then you can decide how to handle that. Closing the door just means your audience can't find you in the first place.