I'll light a fire here

.
Imagine everything you do with your sub during the course of an approach and attack on a convoy. Where are the DDs? Will they turn? How do environmental factors affect this attack? How fast or slow to go? And adding the 3 dimensional element of how deep? Etc etc.
Now, try to program all these into a half-way working AI...
To make subs that act intelligently and are not just targets to keep the enemy AI busy would be a
HORRENDOUSLY DIFFICULT task.
What we would probably get are subs that make themselves targets and greatly decrease the challenge for the Human Player because they make stupid mistakes.
I'd LOVE to see wolfpacks and other subs

. But if they can't act intelligently due to the
millions of variables that a programmer would have to consider? I'd rather go it alone.
No Offense Intended.
Salute!!!