Well this has some really good points. If you change you privacy or security settings now in Gmail they are changed for Google documents as well just like if you were to change you password for gmail it would change your Google documents email already. Makes sense. Also this is exactly what Facebook have in their developer platform. Everything you do through a Facebook app is under the one privacy policy just now like Google Products. Apple have the same thing already too for iTunes, iCloud, iPhone, iBooks, etc. It's just Google couldn't really do it before as they didn't have G+ which links the products together to allow this.