The "motto of silicon valley" is that...writing a book about something is a good way to help you learn it? That's kind of an unexpected take.
Lots of people who've written books, including good books, have made this observation btw. That's because it's true. I've heard some of them say it personally.
This is the motto of silicon valley if I've ever heard it—all the good parts and bad parts smushed into a singular brand. The bad parts are pure narcissism; the good parts are more or less asking "am I doing harm by investing in this predatory business"? Unfortunately, the answer is mostly "yes".