The FAA cares about safety/compliance…if there’s an issue where the government wants/needs the CVR, my guess is they have every right to get it (ie after a mishap). Also, what we’re saying to ATC is also being recorded, and what we’re doing wrt flight parameters is also being recorded/transmitted. To have cameras/recording devices in the flight deck just for someone to see whenever they want, that would be seen as a barrier to effective CRM. Just my $.02