To be fair, I bought Martin Fowler's Refactoring book expecting to learn a bunch of new stuff and up my game. What I found was a bunch of stuff I knew already just from experience but thought was too obvious to enumerate and write down. This was all written a long time before LLMs, of course.

I think the main reason I don't write more is I think once I've thought through something it's too obvious to write down. I consider it a defect of mine and sometimes have to force myself to write.