Git was built for email, because that's the system Linux uses. Commits appear inline. Diffs are reviewed and commented inline.

Email is the review process, and commits contain enough information that git blame can get you a reasoning - it doesn't require you checking the email archive. Rather than a dead ticket that no longer exists.

I can also supply you a list of companies that make use of git's builtin features if you like. But thats probably not relevant to discussing management techniques.