ALC served more cities in the UK from DUB than could be served from LHR by either BA or BD.
I read that four times as Alicante !
Aer Lingus Commuter actually comes at the same time after BA pulled out of Ireland in March 1991 due to mounting losses. BA did have HS748s and ATPs at the time if they had been keen but they've never been able to crack Ireland, (either of them - delete as required !)
Point to point works for Aer Lingus as no one is going to connect in Dublin on anything that doesn't involve long haul. Given that is a contracting market then connectivity will be limited to 4-5 flights out in the morning, the point to point has to support the rest of the days flying.
I would see the likes of GLA being better served by a twice daily A319 than the current Aer Arann set up, certainly on price against Ryanair. I mean when I first started out it was roughly that with two daily jets, a B732 and a BAC111. Given 20 years of relative growth, they've got the same level of seats on the market than they did in 1990.