[kaashif]

I put that kind of thing in the pull request, since that's where the review happens. Every commit links back to a pull request, and people actually do refer back to it. Writing good documentation there is part of the job.

No-one's going to ALSO write commit messages that no-one will see.

[wnoise]

The git history will last longer than the platform hosting the PR.

[erik_seaberg]

Not only is “git log” always up, I can also skim it without opening a hundred browser tabs.

[cozzyd]

pull requests don't live in the repository (as far as I can tell...) and require you to use whatever online interface creates them.

Not sure whey e.g. Github Pull request merges don't include the entire pull request description in the merge commit message.