Was also designed to be accommodating of very diverse flows, like people living on remote islands with spotty internet connections, or people hacking on the kernel on long airplane trips without any connection, or people sending patches by email, or kernel maintainers acting as clearing houses for branches etc.

The famous “git flow” is only a tiny use case of what git is capable of, and Github (and other similar platforms) are mostly designed around those limitations and have otherwise very limited support for other flows.