I've also been reading Jack Bickham's Scene & Structure book, the person who Deborah Chester was taught by, and there's definitely a fashion to to provide a structure for the reader to understand the story.
Clearly the reader demographic has changed over the last 60 plus years since Childhood's End was written, which is a thing, because to maximize sales (readers) one has to appeal to a wide an audience as possible, and classic SF really doesn't do this. This may be a factor in why written SF is a small market.
For example, Childhood's End. Who is the protagonist? Who is the antagonist? Where is the character development? It's arguably one of the classic novels, yet today it would be a hard sell.
NB: Just to be clear, love Childhood's End, and Arthur C. Clarke remains one of my all time favourite writers.