Code is the ultimate reference for understanding a project, while documentation is often neglected, outdated, or incorrect. It can also be difficult to keep up to date.

An LLM may not fully comprehend the code like the original author, but it can offer a different perspective that may be valuable. The only argument I've seen against LLMs is that it may encourage laziness, but this is a flawed argument similar to those made against the printing press, which was said to make people illiterate.

As a reader of the docs: does it require discipline to refer back to the code when needed. Yes, but this is no different from the discipline required to write documentation in the first place. But with a key difference, the discipline is shifted from author to reader.