I wouldnt say "difficult"...but think about how a new player, or a player who hasnt used a given set of rules in a while, would interact with the ruling.
He goes to shoot an aircraft with a "Save/-X" weapon, and his buddy half-remembers that it doesnt affect it. The shooting player opens the book and flips to "Save/-X" section and sees nothing. He then goes to "AA" weapon properties...and not finding it there, the game is put on hold while they figure out exactly WHERE it mentions this...
That's all. I edit...therefore I am

BTW not harping on you. I think this game is going to be ace! A lot of work on my Excel unit builder has got me flipping all through the book. I'm even formulating a mash-up half-Mid tech, half-High tech unit that I want to play...