I don't have a google+ account but need to understand the recent developments concerning them promoting the use of the authorship markup. I've analyzed what I feel is a comparable method of authorship markup via the schema.org micro data use of the CreativeWork tag and it's supporting 20+ sub categories for refinement [schema.org
My question in general is how do they differ and why wouldn't google simply encourage use of the schema.org version that is accessible to all authors without need to have a google+ account. If their intention is really to help authors rather than themselves why are they making the obstacle higher than it needs to be by requiring someone to have a google+ account?
Or maybe due to my lack of knowledge concerning the google+ version I am totally not understanding that their is a difference between google authorship markup vs the creativework micro data schema?