SH4 like backwards

[CCIP]

To play devil's advocate:

Why simulate a force whose doctrine pretty much precluded a commerce war and which had little substantial success in practice?

At least the American sub force was overwhelmingly successful (as players surely will be), while the Japanese had failed to even consider subs for a proper role. A realistic Japanese sub campaign later in war would be more or less that of a submersible transport vessel with a secondary attack role.

I think to dismiss the efforts and sacrifices of the American submariners is also a bit mean. They may not have had it as hard as the Japanese or the Germans, but I think it would be extremely unfair to say they had it easy.