I believe I covered inside and outside the box rather well. My illustration gave example of what submarine simmers enjoy most versus a whittled down arcade version (anything short of the submariner experience without actually being in the sub).
Visit here for an idea of how devoted the submarine simulator community is to realism: http://www.subsim.com/index.php
Adding sub spawns and treating sub warfare like tank spawns in AH won't attract them.
Very aware of the website - I've had an account there for over a decade now... no different than most pilots would agree that pressing E to start your engine, forgetting about fuel, prop, and heat management in your aircraft isn't a whittled down experience for the seasoned WWII sim enthusiast...yet here we are, all still playing Aces High.
No different than a single control panel for your sub, and then a station for a deck or AA gun (assuming we get a Type VII or a Balao-class sub) which was most early WWII sub sims - yet they were played by tens of thousands of enthusiasts. And it is on THEIR wishlist, not particularly ours.