Going back to the reply about B24s... Considering that you land several 30mms in one spot in order to just get a flame, there is almost no damage done. When you land enough hits to blow a wing off, but you only get a fire, that's "almost no damage" -- you only get the fire. Yes, while the fire is terminal and gets the job done, it still remains that the wing with the fire (or the fuselage) absorbed enough rounds to blow it off, not just set it on fire.
Hypothetically, that is.