So I had a bunch of thoughts as there is so much cool starfighter action in there but immediate thing that springs to mind
Y-wings coming full circle as bombers? What was the first EU that decided they were bombers? Was it the west end RPG? Because in the original movies we have no indication of them being the slow, tough bombers that they became in the EU, they zoomed about just as fast as other ships and did no bombing. It's funny how now we have a film with them doing a significant amount of bombing.
(I have to confess, giving Y-wings a "hero" moment was something I vaguely hoped for in R1, so I was very pleased to see gold squadron have a few things to do)
Also canonising stuff like ion torpedoes.. that whole thing could have come right out of one of the X-wing games. So Ion torpedoes as a weapon in FOTG?
Well, LFL created the Y-wing with the intention of it filling the fighter-bomber/attacker combat role for ANH. Canonically, the Y-wing was never really "slow and sluggish" per se. When compared to the X-wing, A-wing or TIE Fighter/Interceptor, yes. But not outright. LFL's official ship specs had always shown the difference in speed and maneuverability between the Y-wing and X-wing to be relatively small, and that despite it's age, the Y-wing was still a capable dogfighter in most circumstances. Their portrayal in the OT was consistent with this.
I believe the biggest cause of the Y-wing taking on the slow, sluggish bomber stigma happened with Totally Games' X-Wing/TIE Fighter sims when Larry Holland and his team used a separate set of ship specs instead of LFL's official ones. The speed and maneuverability rating the Y-wing had in those games was proportionately much worse compared to the other ships. A lot of the other ships' specs were altered too, though (the biggest change probably being the B-wing's).
I also believe the popularity of the X-Wing/TIE Fighter sims over shadowed LFL's official ship stats, and the problem perpetuated when subsequent developers implemented the same ships in their games and would model their in-universe performance off the X-Wing/TIE Fighter sims. Then of course, there were the other forms of media like the comics and novels that exacerbated the issue.
Essentially, we had two separate set of ship specs and LFL/LucasArts never did anything to address the matter. I believe they considered it a non-issue, but the situation created a lot of confusion among fans.
Of course, now with Disney at the helm, who knows what will happen. lol