tl;dr: The author argues against using AI to generate notes in Obsidian or other "second brain" systems, because AI-generated content dilutes your own thinking, creates noise when searching, and produces ideas that are hard to develop further since they aren't truly yours. They suggest limited uses like finding related notes or short summaries (clearly marked as AI), but warn that automated linking and knowledge graphs skip the crucial thinking process where real insights emerge. The value of a personal knowledge base comes from manually building connections over time.