That's also true on GitHub: https://docs.github.com/en/communities/documenting-your-proj...

and on GitLab: https://docs.gitlab.com/user/project/wiki/

It sounds like the whole argument here is that the commits in the docs repo aren't identical commits in the source code repo. But you can ameliorate that with something like tags or submodules. And it's also inherently true of any project with more than one repo, too.