Jonathan_S wrote::D Tell that to the interwar US Navy. Their attack doctrine was to fire while submerged off of hydrophone bearing because it was presumed to be too risky to use a periscope within torpedo range of an enemy formation.
That's pretty timid. (Especially since hydrophones couldn't give accurate enough range and bearing data to really aim the torpedo -- so it was more 'hide in front of the enemy formation and once they sound loud enough dump all your torpedoes in their general direction')
Come wartime it took new, more aggressive, submarine commanders before the USN subs really started achieving results. (Though, of course, the many and well documented issues with their Mk14 torpedoes didn't help -- but if they'd stuck to their timid pre-war tactics they would have had a much harder time working out that there was something wrong with their bloody torpedoes)
The analogy with subs breaks completely down when you consider the cost of an LD. Those are actually capital ships, with a crew of thousands, and a build time of about 3 years after the yards hit stride. They must cost more than the annual GDP of all but a very small selection of Core systems and some others with a big population (say, 5 billion). Anything else would not have the economic capacity to build one, let alone a squadron of them.
So they can't be used like they grow on trees, because they don't. Each one you lose is a huge loss in capital, even for the very-skewed Darius economy.
The MAlign may not have to pay the bills on Darius, but it's at a minimum a cost of opportunity: with the resources and time consumed, they could probably have built 3 Sharks or half a dozen Nike-sized ships.
So, no, the MAlign will not be too aggressive with them. That in turn means that their intended use must be something different and the MAlign strategists have concluded they have a high chance at success in this.