Replacing Scharnhorst's 15 cm battery with 10.5 cm guns

How would Scharnhorst change if her 15 cm secondary guns were replaced by 10.5 cm weapons?

She would gain better air and anti-destroyer defence through faster dual-purpose fire, but lose effectiveness against larger ships.

Replacing Scharnhorst's 15 cm secondary guns with 10.5 cm weapons changes the battery's priorities. The smaller guns offer stronger dual-purpose capability and a higher rate of fire, improving defence against aircraft and destroyers. Their lighter shells would be less effective against larger surface ships. The tradeoff illustrates how secondary-battery design balances anti-aircraft volume against the weight of a surface engagement.