Hacker News Reader

As someone who has done a lot of those things (beyond programming), I can assuredly say that "writing about something" is neither a proof of understanding nor a proficiency in a subject. (Case in point, our educational system)

Quite so.

If indeed all the author's ideas are incomplete until written, his mistake is ascribing this to the power of his writing rather than the limits of his ideation.

I think he also said somewhere that people mainly disagree with distorted versions of your ideas...

Feel free to identify any distortion here.

To interpret it more charitably, perhaps each of these things is it's own language and the activities therein akin to writing.