A few things.
The Japanese in the Solomons were not completely defensive in 1943, nor did the Allies have "free reign". There are numerous accounts of Japanese level and dive bombers operating in the Solomons at this time, including attacks made against targets as far away as Guadalcanal. Add to that not every FSO is going to follow exactly how a campaign may have been fought historically in any case. You can look at any number of other SEA events to see that, including many, if not most FSOs. If you do that, you quickly end up just carbon copying designs that have been done already. In "A Long December" the side split was 50/50. Great FSO as it was, imho, it was hardly representative of the historic air power situation in the Western ETO in late Dec 1944.
The map in use is exactly where the lines were in September 1943. I dont really get the "meet in the middle" stuff. The terrain is what it was. Its an island chain and thats where the lines of demarcation were, I didn't make them up. The airfields are also accurate, for the most part. The plane set is also accurate for the time frame, save the Ki-67, which as I already said, is a stand in for a/c like the Ki-49-II and others. Yes, I wish we had a G4M, we dont yet, I hope we do soon.
You could do many different variations of this setup, and they would all be played out differently. Could you do a more defensive Japanese posture? yes, of course. Do you need to do that every time? I would say I hope not.
There are also many factors that have to be taken into account, the map size and the terrain it includes, and doesn't, the 2hr time frame, and playability issues, such as expected attendance of both sides rosters, ect.
Scoring, is completely subjective. You have to quantify it somehow. If you don't use points, then you would use some other, just as artificial method. There were no "points" or "frames" in WW2, its a game function. At the end of the day you have to have a quantifiable way to say "this is how you did", because its a game, and players want a tally, and so, we give them one.
Hope that clarifies a few things. Im not going to get into some lengthy debate here, but I thought a few points were warranted.