> Write about things while you’re learning them; by the time you’re an expert it’s too late to start.
I totally understand what the author is saying here, it's a valid point! But I also think this is why so much content, particularly targeted for folks newer to development, is awful. It's so often just truly the blind leading the blind, with the authors often firmly in a place of not knowing what they don't know yet. Unfortunately I think it goes hand-in-hand with the audience-building trap mentioned at the very end.
To ruin the old Douglas Adams quote:
> those people who must want to ~rule people~ be thought leaders are, ipso facto, those least suited to do it.
Of course I don't say that to say we should discourage people from writing, but it does require some discernment on behalf of the reader. On places like Stack Overflow a well-meaning-but-wrong answer might get downvoted or corrected in comments, but someone's personal blog isn't going to have that context.