It does rather seem that the decision to install intrusion proof Flight Deck Doors has become a victim of the Law of Unintended Consequences.
Enough previous incidents (LAM, Ethiopian. more?) but authorities chose to ignore.
After the Ethiopian, when I went out, I'd ask the FO in jest where we were going to divert to...
Even if you up the psychological checks on entry (1st Class 1), this omits all current crew, and the prospect of change post Class 1 issue? I mentioned earlier it would be very hard to change the current system without severe disruption to the current airline schedules.