Yes, but what about the various things I block because I don't want a lot of sort=, pagination=, display= and other types of potential duplicate content cluttering up the joint? I could rely on GWT's parameter exclusion (yea right) or rely on Google to figure it out (because THAT always works) or figure out a way to return a noindex (hunh?) Easier just to not use +1, except they're pretty much saying you *gotta* use +1 - at least that's what the clients hear.
They're messing with my systems. Do. Not. Want.