Well, Waervyn has sort of answered my question
However, If you take a look at the playthrough, then you will notice that UBOOT is more a crossover between an actual subsim and a board game, more than a board game in the classical meaning of the term
There is no dice, not much is luck-based and most of the time it is the players' skill that allows them to win against the odds. So, it's not like 'let's roll and see what happens'