good point. There are reasons why you might want to fight–-say the Germans attack the Russian Cruiser and Sub with 1-2 ships, you might have the sub stay to prolong the battle or have it flee its all situational. I’ve seen situations where people rush Novogrod Harbor ignoring the sub there and then getting scrambled against so its like 1-3 ships vs 1 sub and 2-3 planes…
But once the a sub decides to submerge, they’re out and they can’t come back into the fight that battle, and you can decide for some to flee and some to stay…