I got this idea from StuffOfInterest (see User:StuffOfInterest/Userboxes), after looking around to figure out why my atheism and moral realism userboxes got changed from endorsements of the two ideas into the milquetoast "this user is interested in...". I think the rationale for NPOV is an absolute must - for encyclopedia articles. NPOV is inappropriate for userpage content though. See User:StuffOfInterest/Userboxes#Userbox_war for the details on the uprising of would-be userpage-NPOV enforcers.