Originally Posted by
DaveReidUK
The argument isn't that it won't prevent a repeat, but that the two-person rule may have other potential, unintended consequences.
There's nothing "simple" about it.
"Sole control" and "Not sole control" is indeed very simple. It is binary.
What are the unintended consequences of simply requiring a temporary FA/CC substitute for an absent captain (or FO)? Of course there is potential for intrusion every time the cockpit door is opened but that was going to happen anyway, so no change.