I used to do that as well. The problem here is that PR belongs to a particular service provider (GitHub, GitLab and whatnot), and thus can be easily lost if you

I used to do that as well. The problem here is that PR belongs to a particular service provider (GitHub, GitLab and whatnot), and thus can be easily lost if you move providers. Or even if you simply move commits to a new repository (for instance you need to clean out some sensitive information from git history). In that sense having as much context in commit messages themselves saves the day.