I don't agree. If someone has gotten to the point they think they can write anything about a subject it's kind of interesting. Many, many things are undocumente

I don't agree. If someone has gotten to the point they think they can write anything about a subject it's kind of interesting. Many, many things are undocumented because they are trivial to some and completely unknown to others. Experts rarely want to spend time writing about trivial things, so the best way to get these things written is during their journey to expertise when they are new and exciting and when it feels the most scary and embarrassing to do so. In addition, I think people overestimate how long they will retain insights even for personal use. I really, really wish I had been blogging during my education.