Why the PQ 17 disaster could not simply be repeated

Could the Germans have repeated the PQ 17 outcome against another Arctic convoy?

Not in the same way; the Allies changed their procedures and later destroyer screens were prepared to fight through the threat rather than disperse the convoy.

Later North Cape operations and destroyer actions show how the response changed. Convoy escorts were prepared to maintain contact and fight, exemplified by Robert Sherbrooke's Victoria Cross action. North Cape demonstrates that escorts had absorbed the institutional lesson and would contest a surface attack. The PQ 17 disaster altered practice, so it should not be treated as a stable template for later Arctic convoys.