OP is mistaken. The signature designation only implies that it's free of pre-installed crapware and junkware. If one wants a real Nexus like device(branded Google), then Surface is their friend(made by MS).

>as such MS certainly has a responsibility for allowing these hardware specs onto the street

And then get sued by the DoJ and split up by a court. Thanks to the antitrust ruling, MS cannot force anything on the OEMs. If you can install Windows on a 512MB RAM machine and sell it, MS can't do shit to stop you.