Abolition of airport duty = FR introduces more flights/pax, EI to a lesser extent. If the duty is replaced by punitive DAA charges then FR/EI = fewer flights/pax
In fairness, wasn't the airport tax abolition about attracting passengers to all airports, not just Dublin. There's a balance to be found in any policy measure. But it certainly isn't contradictory to provide a general incentive, while allowing Dublin scope to increase charges, if necessary.