I disagree because I distrust helicopters (also multicopter UAVs) as delivery vehicle for lightweight torpedoes.
An ASW missile such as
https://en.wikipedia.org/wiki/K745A1_Red_Shark or
https://en.wikipedia.org/wiki/Type_07_vertical-launch_anti-submarine_rocket or
https://en.wikipedia.org/wiki/RUM-139_VL-ASROC
takes an entire Mk 41 VLS spot, no quad-packing.
Furthermore, I suppose it makes sense to have the option of launching a trio salvo of ASW missiles to form a triangle that forms a large no escape zone for a submarine (save for decoying, had kill self-defence, Alfa-like speed, extreme diving depth and technical failures, obvs.).
Now suppose you want multiple such salvoes. Three salvoes + 1 reserve missile to compensate a technical failure = 10 VLS occupied for ASW.
Personally,
I arrived at 28 VLS + separate SSMs as the minimum, which means 32 VLS in practice.