Rich: It is more or less a technological law: The best represenatatives of a concept are made AFTER the concept has become obsolete.
The best stone daggers were made in the bronce-age.
The best sailingsships were build after steamengines had taken over.
The best propfighters were build after the jetengine.
Good point, and one thats true in "most" cases. Then again lets not forget the fact that even the Yank super-BBs, the Iowas, were designed, indeed their keels laid, before it became apparent naval warfare had moved on past the Dreadnoughts. Even the Montana's were designed before flat-tops became the rage, or at least in between taranto and PH. The argument could also be made that the Iowas were worthwhile, or at least worth their steel, due to their excellence in fire support for amphib ops.
The Montanas could be called the best BB design that never was made. They probably would have been the most unsinkable warships ever built as their steel belts/decks would have been made in the USA, and we made the best steel at the time. Japanese steel was far inferior, as was their BB designs, tho I'd call the Kongo class the exception. At least when they were built as they were ahead of their time.
Generally however??? Japanese BB design, construction, and tactics, were deeply flawed. Even their strategic naval plan was flawed as they consistently fight a stupid naval war. As an example, among many, was their foolish deployment of their excellent destroyer and submarine forces. They had fine boats and an outstanding torpedo but they never used their submarines effectively preferring to waste them as scouts. Of equal stupidity was their refusal to organize a convoy system, which would have been a worthwhile use of their excellent destroyer classes.
Then again if they had used their heads and fought a strategic ground war, instead of wasting so much occupying so many worthless Islands, a convoy system wouldn't have even been necessary.
But I dont want to get into Japanese blunders of WW-ll. I could go on for hours.