but the order of effects is weird and unintuitive if you're used to X-wing's usual I roll/you modify/I modify structure.
I agree it seems odd, but it is not a very good basis to debate a rule on. Rules should be debated based on the rules, and not how someone things something should work.
Oh, I wasn't suggesting that it was a basis to debate the rule. There are lots of weird, unintuitive little cul-de-sacs in the rules, and if FFG rules that Accuracy Corrector should be resolved in Step 6, this will just be another one. (It’s not the first time: see Daredevil and Dark Curse, for instance.)
I’m really trying to explain that the issue is a relatively simple one if you approach it using a brain that’s procedurally oriented. If you have a mindset that looks for the general algorithm, applies the specific inputs, and then observes what falls out the other side, then it's hard to avoid Buhallin's conclusion (not that he's the only one arguing for it, but he's the one that changed my mind).
But if you approach it from the perspective of someone who’s used to dealing with the rules on a more empirical basis—the kind of person that only looks up a rule when you don’t know the answer or when something seems “off”—you’re going to have a very different idea of how the card works. If it weren’t for the never-before-used rule in Step 6, we’d be able to resolve Accuracy Corrector as an attack modification with no problem or consequences whatsoever for the rest of the game, so it won’t even occur to a lot of players that there’s even an issue to be resolved.