Michael Everett wrote:"A fanatic is one who cannot change his mind and will not change the subject."
Winston Churchill
Minor point for consideration, if big ships are the best, why is the American navy not comprised solely of aircraft carriers?
Waiting for more amusement...
Very different economics. Real world USA simply cannot afford to count the number of carriers it has in the navy or builds over a few decades in the hundreds.
How many SDs have Manticore built, partially built or had in its navy in the last 30 years?
How many have it had at most at any one time?
If USA tried to do the real world equal of just building up the Grendelsbane shipyards, it would be ruined before it got halfway, much less affording the CVs that would equate all those SDs.
Also, there´s another HUGE difference, raw materials in the Honorverse is essentially just a matter of getting the needed machinery and ships and go get it from the most convenient nearby asteroid belt, ie, raw material costs will generally not fluctuate much, and as long as no rare materials are needed in too large quantities, raw materials will effectively be "cheap".