1. 01Chronology is not the same as structure
2. 02Alternatives need independent history
3. 03Visible origins make later review faster

Linear chat works while every message serves the same direction. Once a discussion contains competing assumptions, revisions, or experiments, chronological order no longer explains how the conclusions relate.

A visible branch preserves the shared origin and makes the divergence explicit. The value is not decoration—it is the ability to revisit one path without overwriting another.