The OFP already describes the journey
Pilots often treat the SimBrief OFP as a cockpit document, but it also contains passenger context. Origin, destination, aircraft, flight number, distance and schedule all help describe the kind of service being flown. That information can shape the cabin before the aircraft moves.
A short domestic route, a holiday charter and a long international service should not feel identical. SimBrief context helps the cabin understand the difference without asking the user to retype the whole flight.
It also reduces friction for pilots who already trust their planning workflow. Instead of building a separate cabin brief from memory, they can use the flight plan as the common source of route truth and then adjust the tone for the passengers they imagine on board.