QuoteRebel Ion Cannon disables two Imperial Star Destroyers. There are two X-Wings escorting a shuttle. The shields are down on those ISDs. The X-Wings COULD run up on them and proton torpedo the bridges. It's a valid target of opportunity. But their mission is to escort the transports.
Except the bombers were already en-route by the time Leia gave the order to withdraw. Your example would be better if there were also Y-Wings with those two X-Wings who were flying under the assumption they'd be hitting the ISDs after the Ion shots.
Not to mention they're **** slow. The dreadnought was seconds away from taking out the cruiser just before the bombs were dropped. If they were still utilising Y-Wings, I could roll with the idea of them quickly getting back to the fleet and getting the heck out of dodge, but they're not. Poe even refers to it as a fleet killer, presumably with much better range and power than the First Order's Star Destroyers considering they're side-by-side with the Dreadnought and aren't firing on the fleet, whilst they're later in-range to at least fire pot shots at the rear of the Resistance fleet. They might not even have made it by in-time.
Edited by Arbitrator