> It reminds me how LLMs finally made people to care about having good documentation - if not for other people, for the AIs to read and understand the system

Honestly I've mostly seen the opposite - impenetrable code translated to English by AI

Even if the impenetrable human code was translated to English by AI, it's still useful for every future AI that will touch the code.

Perhaps to get that decent documentation it took a decent bit of agentic effort (or even multiple passes using different models) to truly understand it and eliminate hallucinations, so getting that high quality and accurate summary into a comment could save a lot of tokens and time in the future.