Hilco Wijbenga [off-list ref] writes:
Another problem is branches. Branches are per submodule but you want
them for all submodules.
Branches have a similar problem in git-subtree. It is one of the things
I would like to improve in git-subtree going forward. I don't see any
fundamental reason that some git-slave-like operations can't be included
in git-subtree, though with a slightly different model.
-Dave