All very true in real life, but how much is modeled in DW? I know from testing that unless the sea state is very high and/or the bottom type is sand or mud, sonar tends not to be degraded very much in littoral areas. Your point about surface traffic hadn't occured to me, but that's generally up to the mission desiger and only assists slightly as far as sonar evasion.
I remembered another advantage though. In certain green water environments, it's possible to make use of underwater hills and such concealment, but most of the time the sea bottom slope is to gradual to be of any use.
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