The Information Dissemination blog has embedded a video titled "The future of Seapower Lethality". I admit right away; I didn't watch a single second of it, nor am I interested in its content.
Instead, it's merely an occasion to write about lethality of sea power myself :
A look at military history shows very few cases in which the lethality of seapower was of prime importance. Frigates of the age of sail cruiser for years or decades without firing a shot in anger, for example. Having enough spare sails in storage and a good tailor to fix damaged sails was more imporant to a frigate captain than whether his ship carried 12 pounder or 18 pounder guns.
Early gunpowder naval combat even rarely saw ships sunk at all; I remember to have read about a battle in which the participant disengaged in horror when -unexpectedly - a ship exploded.
Most utility and importance of seapower in history was to be found in safe routine patrols and in fleet-in-being functions. To have the survivability and strength (numbers) to patrol routinely instead of being the underdog (and be forced to cower in harbours or under water) was of great importance. The Royal Navy became the dominant navy of the world without excelling in lethality - but it was able to let hundreds of ships patrol (cruise). This meant a huge demand for dry docks, coal storages, coal shipping, ammunition depots and many harbours during the Ironclad Age up to WW2. They were not much concerned with lethality, and didn't need to be.
Navies concerned much with lethality were different navies; underdog navies. The German World War navies were very much focused on lethality, particularly on lethality of the submarines. Eventually, the submarines were defeated or want of survivability, safe communications and logistics.
The really poor underdog navies were the ones which weren't very lethal in at least a niche.*
One might think the American carrier fleets were all about lethality, but their strength was first and foremost their radar-supported survivability in 1943-1945. Their lethality was rather modest (and dependent on luck in 1942), with a rather unimpressive sorties-to-damage_done ratio in most engagements.**
So why would people with naval interests today pay much attention to lethality? Sure, it makes little sense to neglect one aspect, but one ought to admit that the an ESSM missile hitting a speedboat gets more attention than the performance of some plastic foam that's usable to fill up compartments for damage control***.
Maybe lethality - potentially spectacular and easy to grasp as it is - has a little bit too much attention nowadays, and maybe this is one of the many peacetime aberrances which military bureaucracies develop after not being tested for real for generations?
*: The First French Republict had at least some fine corsairs, the German World War navies were lethal with submarines (and MTBs in WW2) at least initially, the IJN had its six-month straw fire with an imperssive amount of prizes captured and the Italian World War Navies had at least fine frogmen (and MTBs in WW1). A complete sucker was the Russian/Soviet navy in both World Wars, and the French World War navies were utterly inconsequential as well.
**: There are not enough low hanging fruits for a spectacular average if you are extremely active, of course.
***: or whether good-enough stocks of ammunitions are available to sustain operations..