Whether or not the zones appear in the manual or not is totally independant from the actual damage zones of the ship.
The damage model itself is still fine and not broken at all. There is still a chance of crippling the engine, destroying the screw, hitting ammo or fuel etc. It's just that you won't be told where they are. Nothing has changed in terms of being able to hit certain areas of the ship, only improved. What is different, is that you are not 100% guaranteed to get the same effect every time. Hitting near the screw might destroy it, but there is a chance it might not.
It's all in the name of trying to create the impresion of a more realistic damage model, where nothing is certain.
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