Sorry, if that wasn't clear but I think MDN is not only reference documentation. I agree, for the reference part the AI shouldn't do more than trying to point you to the right parts of the text. But for learning things, nice explanations, even if sometimes slightly off, can be a lot better to digest than reference documentation.

I'm not saying it's great yet, but there is potential for having something that can hand-wave away some details like a human would when explaining something to a beginner.