For a decade the productivity internet sold you the same dream. Capture everything, link every note, tend a growing garden of your own thoughts, and one day it will all pay off. People spent more time maintaining the system than they ever spent using it, and quietly assumed that was the point.
Here is the uncomfortable part. It was never the tool that was slow. It was that organizing your notes feels like progress while asking nothing of you. Linking a note is easy. Using it to make a decision is hard. The elaborate structure was a very sophisticated way to avoid the hard part.
Artificial intelligence made this obvious, because it does the one job the second brain was supposed to earn you. You no longer need a perfect web of links to resurface an old idea. You can keep rough notes in one plain file and ask a model to find, connect, and summarize on demand. The retrieval you were building by hand for years now takes a sentence.
So here is the twenty-minute alternative. Keep one running note per project, written like you talk. When you need to think, paste it into any assistant and ask it to argue with you, find the gap, or draft the next step. That is the whole system. Warmth and momentum beat a beautiful graph you never open.