30 minutes is unusually long, 15-20 is more realistic
So what is the barometer of measurement then, in that 20 minutes is fine, but 30 minutes is totally unacceptable? I've been in many European airports where the wait is 30 minutes or more on many occasions, Dublin included, so, I'd make sure the glass windows are up to strength before launching the proverbial stones.....
Unless procedures have changed it doesn't stand up and lets say that was the reason makes you wonder how much attention was paid prior.
There were outbound passport checks by UKBF for the first time in ages, but, It wasn't so much there were procedure changes, just people more on edge than usual. I dont know what the coverage of the arena bombing was like in Ireland, but this attack affected a lot of people in the locality, passengers and staff alike, and was very close to the bone. Therefore, it's a difficult one to judge and cast blame on, it was a unique situation.