Once Google's proprietary stuff was deleted, it was not possible to provision a phone (until the FOSS alternates for things like Provision.apk were developed). I can't remember if you got bootloops or what. There were other problems, too. I think AOSP has been friendly toward patches for that sort of thing... ensuring AOSP without gapps works just wasn't one of Google's requirements (at least early on--it may be now for all I know). Not that you can really fault them for having different priorities.