Are these generated descriptions of LLM submitted changes or of human changes? If a human, shouldn't they be putting the motivation into the PR?
LLM-generated (or at least LLM-assisted), but a human's still the one submitting the PR for review.
My company has an AI tool appending a summary after the human one. As far as I can tell, people aren't reading it.
If people create the PR using something like Claude, you get an AI summary after another AI summary.
In my experience even before LLMs came along it was a matter of engineering culture how much a human put their motivations and rationales into why their diff came out the way it did.