1. CC are given access to the FD anyway to deliver refreshments so the risk of one with evil intent is not much changed whether there to act as door opener or to deliver a cup of coffee
Typically with 2 pilots on the Flt Deck,
not one.
3. In any event, as I understand the sole pilot is supposed to be always at the controls and strapped in when the other has left FD. The CC only needs to be standing at the door ready to allow access and can call for assistance immediately if the remaining pilot makes any move to leave the controls.
Exactly - the CC now
knows they will get access to the Flt Deck, they
know there will only be one pilot with them, strapped in, and they
know they can override the Capt's command and controls to allow
anyone access to the Flt Deck.
4. I would agree that CC will often not be qualified to judge the remaining pilot's actions but that's not part of the requirement. The job is simply to guard the door and re-open it to the anyone
And with a guarantee they can override anybody else in order to do so.
Moreover, if it is not an improvement, why was the "two persons" rule implemented by some regulators and some carriers even before last week. The answer is simple -
Yes it is - a
PR stunt, and if you actually read the EASA/CAA recommendation, you will see the "2 in the Flt Deck" recommendation was only after a review of the risk assessment, and as part of that risk assessment. Some airlines managed, and announced that review conveniently for TV deadlines rather than safety IMO.