Why submarines played a different deterrent role

Why were submarines not discussed more in a talk about Royal Navy deterrence?

They contributed through covert intelligence and uncertainty, but their effectiveness depended on remaining unseen, so they could not provide the visible presence of cruisers and destroyers.

Submarines contributed to Royal Navy deterrence without serving the public presence mission at the center of the talk. Their wartime strength depended on concealment. In peacetime they were better suited to intelligence gathering and to creating uncertainty when an opponent knew a patrol existed but could not locate it. Surface ships provided visible reassurance and signaling; submarines supplied a concealed threat.