More manta from the Europeans and Brits that unless something is perfect, it's not worth doing at all.
What a bunch of naive, defeatist, stupid, handwringing hogwash.
Security has to be a layered. Each layer sieves out more and more. A breach resistant cockpit door is the next to the last layer. Procedures for access (curtains/intercom, etc) can provide minimum risk for being caught with the door unbolted. The final layer before command of the aircraft is lost is armed pilots. With the primary layers (profiling, physical searches) and the secondary layers (aircraft), the probability of losing command of the aircraft is very low.
Sweating nonsense like rapid D when faced with a clear and present danger like today is irresponsible. We can get better engineered doors later. Lets get breach resistant doors in place now that can at least give the pilots a plenty of warning to take appropriate, including, if they feel necessary, lethal action. It's not perfect, but it would be as good as we can do to keep flying RIGHT NOW.