Question around git-shell usage in Everyday Git

In the Repository Administrator section of the Everyday Git document it shows how to allocate accounts to developers so that you can have fine grained control over access to the repository (I assume it is because of that. Otherwise I assume you would do what I have done, and that is create a "git" user, with a home directory where you want to locate your repositories and then tell your users to put the following sort of entry in .git/remotes/xxx

URL:git@host.com:repository.git

and in ~git/.ssh/authorized_keys putting all the developers public keys.

). But the example shows creating independant home directories for each of the developers - but then limiting their access by giving them git-shell as their shell.

I assume they would then user a .git/remotes entry of the form URL:host.com:/absolute/path/to/repositories

My question, in this case is there any reason (such as git creating home directoriy temp files or something) why each developer could not have their home directory as the root of all the repositories (ie where my git user in the above example had its home directory).

This would then mean each user (unless he had a real account on that machine) would then use the following in .git/remotes

URL:host.com:repository.git

Which has the advantage of not revealing exactly where on your filesystem you have chosen to store the repository (or more precisely allowing you to move it without all users having to change their.git/remotes urls)