I'm not Alanis.
Perhaps, ironic was an unfortunate choice of words, but I didn't mean it in terms of sarcastic/sardonic. There is an alternate definition:
happening in the opposite way to what is expected, and typically causing wry amusement because of this.
"it was ironic that now that everybody had plenty of money for food, they couldn't obtain it because everything was rationed"
(e.g. paradoxical, incongruous)
Shortly after 9/11 when they were first proposing armoring the cockpit doors, I remember thinking: "But, what if you have [a legitimate need] to get in there?". Hence, the irony for me. If the locked out pilot had access through such a maintenance port, he might have been able to override the suicidal co-pilot.
After GermanWings, there are new proposals:
(1) Europe adopting the U.S. policy of two crew members in the cockpit at all times [even if one is a flight attendant].
(2) Aircraft flight systems will [forcibly] take over flying the plane if they detect something [egregiously] unsafe--not merely warn the pilot.
(3) Allow a ground based pilot crew to take over flying the aircraft remotely (like a drone aircraft) if something is unsafe.
(4) Not allowing [as is presently allowed] a single person to disable the cockpit door unlock codes/keys.
Remedies (2) and (3) aren't limited to just a suicidal pilot. Hypoxia may overcome both pilot/co-pilot before they have a chance to switch to oxygen.
But, if people are screaming "beware of hackers" now, just imagine the hoopla surrounding implementation of (3). Although remote drone piloting is used by military drones, there have been some [unconfirmed] reports of nefarious people being able to take over drones.