Worth noting that this is stored in the repository alongside the code changes and can be referenced in the future if someone is trying to understand that code or fix a bug in that code.

For large projects spanning long periods of time sometimes the best way to find a bug's cause is to scour the projects history to find out which commit caused the bug to appear, and if that commit doesn't have a good description you're unnecessarily disadvantaged when trying to find out why it caused the problem or what assumptions were going into the original code.