Back in the days when the RAF had lots of aerodromes, some chap diverted into an unfamiliar place due to Wx.
After the '10:00 clearance' had (for once) actually made its appearance, he rang the grown-ups back at base for clearance to finish the previous LL sortie (stats needed for the boss's board.....
). This was granted and off he went - only to hit something he hadn't known about and park his jet on a windswept hillside whilst he thought about things during his M-B let down.
Without the umbrella of the Duty Auth's 'out brief', it seems that he'd forgotten to check the NOTAM update (or whatever)....and there was an uncharted obstacle on his route.
In the big aeroplane world, we used to have a formal pre-flight briefing at which the Auth (if not on board) would be present. Some ex-FJ flight commander suggested a world of 'outbriefs' and 'duty auths', but the Boss reminded him that our pre-flight brief was entirely adequate, having been developed in the 20 or so years the squadron had been flying the aircraft.
So 'Outbriefs' probably have their value in some worlds, but aren't really needed everywhere.
Mind you, before I had self-auth status, I was once pre-auth'd to fly an aircraft back from Hawaii 2 weeks into the future. Where was the value in that?