To be fair, realism in computer games is always discussed, regardless for what title. Even tho the fall-back excuse is "its a game" there are games out there which get very close to realistic conditions or at least hack it in such ways that its hardly noticable. Mostly "some aspects" of any given feature is realistic while the rest is bent due to the rule of cool or in order to allow gameplay in the first place. FTL travel and artificial gravity itself tho is purely theoretical and based on opinion. Current knowledge doesnt allow for either or makes any of them impossible to achieve but 200 years back people claimed that its impossible to fly or go faster then 50kmh so the next break-through might be just around the corner ^^