Were the Königsberg-class cruisers mainly training ships?

Were the Königsberg-class cruisers best understood as training ships for personnel and industry, and were their diesels related to submarine engines?

They could train people and preserve industrial knowledge, but multiple ships would still become combat units, while the diesel-engine comparison remained unresolved.

The viewer's argument treats the Königsberg class as a way to train officers and ratings on triple turrets, anti-aircraft weapons, torpedoes, targeting equipment, turbines, and diesels. Building the ships could also preserve industrial knowledge needed for larger warships. That classroom function may explain one vessel, though it does not fully justify building several. Because the cruisers would remain useful into the 1940s and inevitably join the fighting fleet, Germany still needed to think seriously about how they would perform in war. The relationship between their diesels and submarine engines remained unresolved and required further checking.