Cannot cheat fate
Aer Lingus are incompetent idiots and if it wasn't this then something else would soon have come along. Yes I know people will say this was a technical issue beyond their control but it's up to the airline to have a diverse disaster recover plan that is checked regularly for function.
Ryanair are actually running rings around the state carrier which either says Michael O'Leary is doing a great job OR that Aer Lingus are THAT bad!!
During the aftermath of the pandemic Aer Lingus behaved like a bunch of thieves with monies for flights that didn't fly and spent a lot of energy fobbing people off with vouchers that half the time were used to purchase other flights that didn't fly either!!