Both were rendered useless hulks long before they went under, though.

Considering how the sunk ships at Pearl Harbor were refloated, refitted, and put back into service suggests otherwise.

That's great if you're in a shallow anchorage (average depth: 45 feet). Less so if you sink in the Arabian sea and you're under fire during the refloating process.

I also suspect modern ships are a little more sensitive to complete immersion.

Case in point: https://en.wikipedia.org/wiki/Helge_Ingstad_collision

> In May 2019, the Minister of Defense was presented with a report from Defense Material which concluded that a possible repair would cost 12–14 billion and take more than five years. The cost of purchasing a new corresponding vessel was estimated at NOK 11–13 billion, with a completion time of just over five years.

And it didn't even go all the way under.