Goes both ways. I had a phase of trying this and found I had to invest as much or more effort figuring out how to document stuff for the eyes of an outside observer as I did on the actual task. Guess maybe the answer in my case is to not make it accessible, but does that defeat the purpose?
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.