Alex, great article. I recently posed a question on Reddit’s startup community about blogging, particularly blogging for a startup vs an individual. The response i received were amazing. It turns out that many startup founders blog about their journey. It gives them clarity (your point), and gains them a following and a fan base who are vested in the personal success of the founding team.
And, of course, well-established startups can and do blog. I am not sure, however, to what extend later stage executives write and blog.