Usually there is no reason to go deep. To go bellow layer yes. But deeper ?
With peace time missions there are also safety margins. If you are near max depth, you cannot recover from flooding or controls jam that easily. Emergency blowing is way slower at high depth, and so on.
You would use maximum depth when evading threats you know about. As for weapons, I have no idea, but I guess that it's easier to make torpedo run well at large depths, than it is to make a sub operate there.
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