It’s a different problem. git clients and applications generally expect there to be a ‘master’ branch. Although there is no necessary special status of “master”, I’ve had problems with some git clients setting up repos that didn’t have a master branch.
We buy and large aren’t serving styles directly through GitHub anyway, are we? They are served through the Zotero Style Repository. We are also transitioning to serving the schema and spec through resources.citationstyles.org. Is there need to orient the styles repo around serving the styles, rather than around development?