Theemile wrote:David, of course, was reflecting historical arguments from the end of the age of sail/early days of Steam in the books. The historical Jeune Ecole argued for torpedo boats against expensive battleships in the years leading up to WW I. In an era without heavy warfare, the political admirals will rise to the top and young thinking will be stymied - sometimes for good, sometimes not.
The problem with a lot of these "hard counter" type units is not working out how the enemy will react to mitigate or counter the counter.
Ok, torpedo boats were part of what made it too dangerous to operate battle fleets close to a hostile coast -- witness the UK's distant blockade of Germany in WWI. They judged a close blockage too dangerous in the face of torpedo boats and coastal submarines. And attempting it would have been even more dangerous to the fleets of battleships that existed just before the introduction of the torpedo boat.
But very quickly battleships were built or refit with quick firing anti-torpedo boat guns, and the navies with big battlefleets diverted some money into longer ranged small escorts able to help break up and drive off torpedo boat attacks (the torpedo boat destroyers; which then morphed into destroyers). So the danger of torpedo boats was largely mitigated and they were no longer particularly effective at countering a balanced battlefleet. So, now what do those Jeune Ecole navies do?
Of course the other issues with historic torpedo boats is their short range and poor sea keeping; meaning they might serve to keep someone else's 1890s fleet from parading off your coast during reasonably good weather. But in poor weather they're far less effective, and if you ever decide you need to project power then all the money you sunk into those short range defensive craft does you no good. OTOH I believe the Jeune Ecole advocated for cheap numerous torpedo boats for defense and fast powerful cruisers for commerce raiding and force projection.
And then in reaction to the later you got the first battlecruisers; far larger and more expensive than anybody's cruisers but with their speed, firepower, and range, designed to run down and destroy those raiding cruisers. (And in turn more powerful better defended 2nd gen BCs were built to counter the 1st gen BCs -- except now they were too expensive to generally be allowed to go haring off commerce raiding). But the enemy always reacts; and you should be trying to look a couple potential reactions ahead, not just congratulating yourself on developing the perfect "hard counter" to their existing capabilities.