I don't think this kind of coverage helps to encourage the case for maintaining a soft frontier when Immigration control seems to be the big topic of the day for UK brexit
API will be compulsory shortly for all passengers flying to/from ROI. You can be sure DUB is not the first and won't be the last where this has happened. If I was an airport operator I would urgently review rules/policies in relation to this at any airport.
Passports/ID are now all been scanned on arrival (phased basic started this month).
BTW it's far easier to get into the UK by ferry than going to the effort to fly into DUB first.....or just take the Eurostar via Lille as exposed by the DM.