Amazing question, I'm glad you asked. Doing some of the core work in https://github.com/purpleidea/mgmt/ I'd love it if it wrote perfectly elegant code. Opus 5.5 needs constant correcting, as if it intentionally makes style/design mistakes.

Why do I care? It's obvious that models base their performance from code in the vicinity, and ergo, if you have style/design/bug issues, gradually your code base will tend to get worse over time until it's unmaintainable.

Therefore, if I use an LLM, I want the output to be as pristine as possible. The first Fable release was exactly that. Since then, something happened, and I can't get the magic back.

This isn't to say the models aren't incredibly useful, of course they still are-- it's just that they need constant review and supervision if you don't want to end up with total garbage long term. I suspect the real magic is not being shared with us plebs.