I think the answer to Beery's original point is that the WWII sub Captains didn't have those historical figures to relate to because they were creating those figures with each mission.
They went to sea in the hope of sinking as much enemy tonnage as possible and then getting themselves and their crew home safely. Some would have taken greater risks than others. None of them knew if they'd survive the current mission.
The reason I state over and over that this is a game and not a simulation, is because we can alter the parameters of each mission or career to fit our mood or our needs.
In my view, for this to be a sim, 100 percent reality settings would need to be forced on you just as they were forced on the real guys. But if that was done, then most people would find the game too challenging and not enough fun.
Therefore, we use a mixture of reality settings and mods to make this game what we want it to be. We tweak things like the number of radio mesages we receive, the number of air strikes, the srength of our weapons, the accuracy of our sensors, our fuel consumption, our battery discharge rate, how good the enemy is at detecting us etc.
Silent Hunter 4 is a $49 video game targeted at people who want to play at being a WWII Submarine Captain and go to sea and sink enemy ships.
Enjoy it for what it is.