Tcabril onething thst seems wonky is buying things such as tires OAF but thst is due game mechanics. By buying an object OAF, the object's DEF doesn't benefit from the vehicles DEF. I.e. if an armored car has 10 DEF and the tires are OAF, then you go by the tires nstural DEF (2) vs. the cars 10 DEF. Also by defining an object as OAF, then it I'd easier to hit in combat.