I feel that while shields as written are fine for your standard personal defense shield (Ala Kyle Katarn/Jedi Knight) or starfighter combat, how would you depict the shield systems as say, on a Destroyer droid, or that the Gungans used in EP1?
I feel like a shield like that should more realistically provide soak or armor, since it completely neutralizes blaster attacks of a certain caliber. You can't break the shield no matter how skilled you are- you just need a bigger gun.
The RAW also doesn't go into situations like, what if you mount a starfighter shield on a load lifter or skiff and use it as a heavy weapons platform? Wouldn't it gain Armor in addition to defense bonuses? I mean, you wouldn't be able to snipe the guy anymore.
How would you handle this?
I personally would say that starfighter/capitalship armor values also factor in the shield values, therefore something wild like strapping a Ywing Shield generator onto a platform would grant you half the armor value of the Y-Wing, something like 2 + the Defense bonus.
I don't consider this terribly wild, because honestly at this point your talking about using tanks and airstrikes and stuff.