I've heard about this before. The very very best are people you've never heard of. Why?
Because they spend nearly all their mental resources on perfecting their craft, not writing blogs or marketing themselves online (which is an entirely different skillset). Not to say that there aren't very good people who also write blogs or give talks on certain subjects. Just thinking about it from first principles. All things being equal, those that give 100% in one thing will edge out someone who split spent 90%/10% blogging/marketing on that same topic.
Working alone prevents you from standing on the shoulders of the giants around you. Working alone prevents you from challenging yourself against the best and learning from them. Teaching others close to your skill level, forces you to understand your own skills and gives you more insight into changes you can make.
In my experience, highly skilled people seem to be unusually skilled at a wide variety of disciplines, including soft-skills and apparently unrelated skills to the one they are known for.
Edit: sure, there are a lot of bullshit bloggers and marketers. One signal of very talented people is they are good at filtering for good information. Or they can pay attention to bullshit and pick out the one useful insight. Or perhaps use bullshit as abstract noise to smash out interesting ideas or test themselves against.
Edit 2: The problem is not that experts don’t publish, it is that “unskilled and unaware” is published in such abundance. I think Dan Luu writes about the problem very well: https://danluu.com/hn-comments/ . . . I do think there is confirmation/selection bias that we only see the talented that write, but I also believe that the most talented communicate to better themselves, and those that don’t communicate are holding themselves back from their potential.
Because they spend nearly all their mental resources on perfecting their craft, not writing blogs or marketing themselves online (which is an entirely different skillset). Not to say that there aren't very good people who also write blogs or give talks on certain subjects. Just thinking about it from first principles. All things being equal, those that give 100% in one thing will edge out someone who split spent 90%/10% blogging/marketing on that same topic.