IMO, documentation becomes much more important if we're planning to hand off coding to the LLMs
You can ask it about the code, sure, and it'll try to tell you how it works. But, what if there's a bug in the code? Maybe the LLM will guess at how it was supposed to work, or maybe it'll start making stuff up to justify the bug's existence (it's actually a hidden feature!)
The docs say how the code should work. For an LLM that has to go relearn everything about your code base every time you invoke it, that's vitally important
You can ask it about the code, sure, and it'll try to tell you how it works. But, what if there's a bug in the code? Maybe the LLM will guess at how it was supposed to work, or maybe it'll start making stuff up to justify the bug's existence (it's actually a hidden feature!)
The docs say how the code should work. For an LLM that has to go relearn everything about your code base every time you invoke it, that's vitally important