[biosthetique]

I like your vision Brag.

I would add:

Possibility to pilot and operate any freighters or commercial ship to experience what it was to be in a convoy hunted down by submarines.

Then, the possibility to take total control of a Destroyer ,ASW trailer, or Frigate class to hunt down submarines.
That feature was made possible in "Enigma Rising-Tide", and it was a very interesting experience.
Then a game called "Destroyer Command" WWII Naval Combat Simulation, was also about hunting down Submarines. Game which was designed to be used in Multiplayer to hunt down submarines from Silent Hunter II. It was unfortunately a failure as an online game due to code incompatibilities, yet a great concept ahead of it's time that could be revived today.