> There is No C

Well yes because git was supposed to be completely distributed. You can design a system which has this feature but then it wouldn't be as distributed as git, making unrelated forks second class citizens. It might still be a good idea for tool to have it but it is not strictly a better/worse scenario.

> Mutability

I think i can mostly agree to this. I do wonder if people never work in a scenario where they are only committing partial state and not complete state. Nevertheless being able to track and not losing uncommitted state is a strict improvement.

> workflows

Aren't worktrees enough here?