Does anyone actually maintain a decision log? how product teams capture the reasoning behind roadmap and prioritisation decisions.

I've been talking to a lot of PMs and the pattern I keep seeing: everyone knows they should document decision reasoning, almost nobody does it consistently past the first month. The log goes stale, nobody updates it under shipping pressure, and six months later a new hire asks why you deprioritised X and nobody really knows.

Trying to understand if this is actually a painful enough problem to build tooling for. Not selling anything.