Key point here is that what a few might like isn't supported by enough revenue. The daylight flight means missing a full working day, and so however owenc might want to rearrange a market to suit his ideas, that's not how life works. If indeed they're just "having a go" to "see what happens" then someone in route planning needs a career change(!) Aer Lingus need to maximise their assets in summer to pay for the lean winter months which means making as much €€€€ as humanely possible.
Daylight flights are also comparably rare to LHR.
VS offer JFK/EWR, BA JFK/BOS, AA offered ORD and are opening PHL, and UA offer IAD/EWR. With AC on YYZ, it's a single flight from each major Eastern hub really with no London connections offered.