RyanAir have a distinct advantage in that they have, more aircraft and crews in non affected airports, to draw on. Also the pax do not have the same level of service expectation that the Aer Lingus customers have.
I can't speak for events in Ireland recently, only those in the UK on the 23rd.
"Where were the duty managers"?
Well in London they were busy phoning around trying to find transport and accommodation for 300+ passengers, at 2am that's no mean task!
I can see both sides of the story and understand that pax need positive information! There's not a great deal to be gained by offering yourself as a sacrificial lamb to irate pax. When your energy will be much better used actually resolving the problem!
It never fails to amaze me how abusive pax can be with the airline staff!