I appreciate the framing. I think a lot of “second brain” attempts fail the cost/benefit test unless there’s a very specific, narrow use case.

The “git docs dir / pkm fragment” idea is exactly the kind of wedge that feels realistic to me: a small, scoped corpus with clear boundaries, where an LLM can be useful as a collaborator (RAG, summarizing, filling gaps) without you committing your whole life to a system.

If you were to try a small fragment, what would you pick as the smallest useful scope: a single project docs folder, meeting notes for one team, or a personal “decisions log”?