Realism? Schmealismm...! The only thing I care about is getting back to base in one piece and have Doenitz shaking me warmly by the throat... Seeing as I have to tuck the crew in each night and read them bedtime stories... I have actually served on RN Submarines (late 1980's) and it was the Exec's job to do the 'paperwork'. The Captain had done it all before, when HE was an Exec learning the trade! Realism is about overall responsibility, not about minutiae. Each to his/her own.
Unless you have been in a "real" submarine and undergone a "real" torpedo firing procedure, "realism" is just a joke word...