I sadly couldn't find any answers to this question, probably because it's quite niche, so i'm posting this as my first question here!
The https://en.wikipedia.org/wiki/HMS_Dreadnought_(1906) was probably one of the most influential ships of its time, and pretty much paved the way for many of the design-elements which would shape modern Naval-warfare in the 20th century into what it was. It's creation lead to a new class of battleship being created, the aptly named "Dreadnought." The main characteristic of a Dreadnought was it's uniform Main-Battery, an "all-big-gun" design.
The ships built before, and made obsolete by the HMS Dreadnought became known as https://en.wikipedia.org/wiki/Pre-dreadnought_battleship, and unlike their successor, these ships mainly featured only a few medium guns, supported by a large array of smaller guns mounted to the ship's sides.
My question would be, what would need to happen in order for Pre-Dreadnoughts to stay the dominant form of Battleship well into the 20th century (possibly up until the 50's or 60's), and what would naval-warfare look like as a result of this change?
Side Note: The evolution of the aircraft in my setting has been stunted to the point where they effectively do not exist, so air-craft-carriers aren't really a factor in this question.