jetstreamrider
Because at the end of every single flight that is operated with this crew complement, one of the two sitting in the seat at the end will for the most part have been awake for the whole of their body clock night time .....presumably the FO unless the Captain has been particularly benevolent with the rest or they are from different base areas. And instead of being able to slope off for forty winks and let a well rested FO take over they'll have to sit there for the landing. Hull loss aside, this is far more of a threat to flight safety than 3 crew ever was....at least with 3 crew, the 2 in the seats for the last bit should have had a modicum of rest.