Earlier quoted context omitted.
If your docs and PR descriptions can be generated off file diffs everyone's time could be better spent scanning the diff to come to the same conclusions. Consider using your PRs and docs to capture the answers to the usual why questions which LLM won't be able to do.
The why is largely in the ticket and the what in the pr.
I will admit that a lot of the really old decisions don't have much relevance to the current business, but the historical insight is sometimes nice.