> You can assign, at the repo level, sub-repos to include in this one, get an atomic commit hash for the state of the whole thing, and where my VCS client does

> You can assign, at the repo level, sub-repos to include in this one, get an atomic commit hash for the state of the whole thing, and where my VCS client doesn't need to actually download every linked repo, but where tools are available to act like I have. Mercurial subrepos work a lot like you describe.