I think it would be hard for a developer to make a business case for this.
Submarine games are already a limited niche market. A lot of people play games for the excitement and action. Unless you artificially create a war (Red Storm rising), I don't think that modern nuclear submarines fit in with action and excitement.
I am sure that there are some who would love to spend their time silently following a boomer being unable to do practically anything except very small and gradual changes in course, speed, depth for days at a time. But I would not want to invest any money in that demographic.
Then there is the niche market would be interested in exploring the inside of a modern submarine. This niche wants realism and reproduction of the actual inside of a submarine.
The intersection of those two niches would be the target market and i don't think that would support a for-profit developer.
Perhaps, from a marketing standpoint, the two should be treated separately.
Games for those who like game play and the necessary distancing from reality.
Simulators for those truly interested in the history/technology and do not want any distancing from reality.
Trying to develop software that is both a game (fun to play) and a simulator (high fidelity to realism) at the same time is not easy.
There are always compromises and hence dissatisfactions. This is especially true when it comes to submarines where the reality is not non stop excitement and action.
I think the last thing anyone wants is a submarine simulator that is always 100% accurate. .
