On the 0.16.0 release it was more like 10% autofixable on the codebases I maintain. One of them had 100+ unfixable errors across less than 10k lines of code and tests in total. Previous ruff version labeled it perfectly clean on format and check with default settings.

Good thing we have LLM:s that can do the tedious work of checking each case and applying local annotations or updating the config globally! If I was stuck doing this manually, I would have just gotten rid of ruff and went back to black+pylint.

In reality it got me 30% there.