The reasoning behind a decision is more valuable than the decision itself. When you record why you chose something, you give future reviewers enough context to know whether the conditions have changed. Without that record, decisions get relitigated from scratch, not because the original choice was wrong but because no one remembers why it was made. [[Software design should be opinionated]] needs this kind of record to stay coherent over time.
[[Documenting meetings]] is the lower-fidelity version of this habit, capturing smaller daily calls before they fade. The log earns its value when someone new joins and needs to understand the system without re-running every conversation from scratch, the same need that [[Scorecards to pilot design system migration]] addresses when the system itself is changing.