Did the tests still provide useful damage-control data?

Did the tests yield useful damage-control information?

Yes. These and later tests conducted according to the rules informed damage-control practice and subdivision in later US battleships.

Useful damage-control information did emerge from these tests and later tests that followed the rules. It contributed to damage-control practices when those practices were properly implemented. Subdivision in later US battleships is offered as an example of the resulting design work. The lost observations aboard Ostfriesland therefore do not make the wider testing programme worthless.