In the same way that new captains are not [supposed to be] rostered to fly with inexperienced F/Os?
Don't get me wrong, new Captains aren't thrust into normal ops unprepared. They have an extensive programme of line training then more flights with a 'normal' line FO where the line trainer sits on the jump seat.
Then during the first 25 sectors flown without a line trainer the Captain must do all the takeoff and landings to allow themselves to bed in. They also are subject to increased minima for the first 50 sectors:
- extra 200m visibility required for take off and landing,
- extra 100m visibility for a low visibility (CAT II) approach (This restriction lasts for 100 hours flying)
- Max crosswind 25kts if runway less than 30m wide
Yes you are correct, rostering will ensure no two 'inexperienced on type' pilots will fly together. Inexperienced in this instance is less than 100 hours in 120 days or 150 hour total time. Mind you, 100 hours on type in not really very much if the pilot is straight out of school but then even a new upgraded Captain should know what they are doing!