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I like the idea of a second brain or similar because writing helps me to think. If I start writing (instead of free thought), I more systematically explore something. This is useful for any type of rational thought that spans an even slightly complex space.

Some are good enough at operationalizing information and thinking more systematically without tools. They don't need these tools, but may get stimulated by using/maintaining them.

The problem is that these tools are sold as a way to level up. Instead, these tools are a crutch for most, self-fulfilling meticulousness for some, and a game changer for still others.