The goal with Mutagen is real-time remote development, not source control or complex networking. It's designed to facilitate making changes to code locally and then having those immediately propagated to a remote system for compilation, execution, etc. Basically, it's designed for the work you do between Git commits, saving you the need to do a full commit, push, pull, evaluate cycle to test your code on a remote system.

Basically, it's like VS Code's remote development extensions, but editor-agnostic and more flexible.