I suggest it should be changed from +0.5% defense bonus to just +0.5% weapons (multiplicative with your weapons%). So it retains its use defensively, but also works offensively. If you stack all your points on it, you'll reach about +30% by end of set. Useful for warring, but at least a good contender versus everyone just going for Turns all the time while warring.

Could also be useful for netting since it allows you to carry less units, spend less oil, giving a benefit much like a % reduction of expenses would.