In scenarios, I'm always trying for this: historical realism subject to playability.
Generally full realism and playability pull in opposite directions, and we have to find a balance between the two in order to get people to fly in it.
As a result, compared to what is historical, we almost always have far more fighters/bombers, far more air-to-air/ground-attack, far more axis/allies, more most-popular/less-popular fighters, better radar, better weather, sorter times to combat, more-even layout of airfields, more-even layout of targets, etc.
In the Ardennes battle, all of the allied fighters were doing mainly ground attack with some air-to-air combat (including Typhoons, which had some air-to-air fighting mixed in). But we can only get about 5 pilots per side willing to do majority ground attack, and the rest of the fighter pilots want to be doing majority air combat. So we have to pick one group that is dedicated ground attack with the rest not dedicated to that. P-47's were the most-numerous ground attackers in the battle, and they are the dedicated ground attackers here.
