TheNaziSpacePope

How do you feel about it being no faster, deeper diving, or heavily armed than its Russian counterparts?..or there being only three of them.

Not sure if this is quite the right question for you, but how significant are generational advances in submarines?

With tanks for example there is little functional difference between a T-72B and a T-90A, but with fighters there is an absolutely massive difference between an F-15 and F-22, and with rifles again there is no real difference between even an M16A1 and M4A1.