Every media takes liberties. No book, movie, show, or game can be 100% true to life.
Books are written as the author's point of view, with always has biased.
Movies most always take liberties for the understanding of the audience, or for action, simplification, for cinematic scope, (some of those shots in das-boot were almost impossible to film), and pure difficulty and budget of filming.
TV shows are worse than movies on those points and more.
And last, games, There is no way to accurately recreate enemy AI, ships reactions, weather...well basically all of the real world...that is if this isn't the matrix...spookuler
If they could create 100% realistic game most of the time, we would be bored to death
