[rst]

Can't necessarily speak for the author, but here's one thing that can happen:

If the underlying system has a newer version of git than the one freeze-dried into your container, repositories managed there by native-git might be in a new format which container-git can't handle. (There might be some new, spiffier way of handling packs, for instance, or they might have finally managed to upgrade the hash function.) And similar issues potentially arise for everything else you're packaging.