Probably because Japan wasnt as advanced in ASW as the allies. That said, its quite easy to design a jap tin can which can depth charge the snot out of anyone. Slighly beefing up the AI was one of the very first things i did in SH4, and If i really wanted to, i could conjur AI settings that are twice as hard as GWX, that you have absolutley no chance to evade.
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