Sure, writing helps with thinking, but the final written output is an educational product that ought to be built and tested around the needs of the reader, not the ego or indulgence of the writer.

(It's also worth noting that the article is built on personality-specific advice, and not everyone is wired or able to think via writing. I personally love it, but a whole lot of people will only receive useful insights and clarity by talking through new ideas and issues and not via of writing about them.)