mostly for the fact that they had mostly 20 mm i think and they are highly inaccurate if they had 8 mm mgs on the aa batteries they would have been "fine"
Imperial Japan; build the Yamato-class Battleship class; give a crap ton of AA guns and main battery shells that shoot down aircraft; IJN Yamato sinks by a lot planes; IJN Yamato sinks by a lot of planes