Downwind Left - I agree with your points. This is exactly why Aer Lingus assets are preferred at DUB (and Virgin at LHR) rather than MAN. And also why the Iberia A330 fleet may represent a more promising source of additional IAG aircraft than Aer Lingus for the MAN operation in the future.
I think most on here are quite realistic about the reduced Transatlantic outbound market post-covid, with exchange rates a major factor. However, there is a strong argument that the extent of the capacity reduction now seen is overdone. Demand on MAN Transatlantic is not about to recover to Summer 2019 levels, but that doesn't mean that present capacity is adequate pitched so far below those levels.