"The three big issues that are eating away at what I would call the core of science fiction: political manifestos, screen stealing and escapism from life’s complexities."
Another device that has entered Science Fiction bandwidth is the space taken up by emotional characterization. This can take the exact opposite intent of escapism. In this day and age, I can understand people not being entertained by cardboard characters even if there is a wildly thought provoking story zipping along. For me, it becomes a loss of bandwidth in presenting a story, when past events, such as including an ex-spouse and wayward children who have no part in the story, or other past events in a characters life, are prominently mentioned in the story.
Going way back in time there have been countless stories were the emotional content drove the entire story, that is the primary story. But if the emotional content is thrown in to considerably expand a characters presence, that ultimately creates two distinct stories. In order to keep the intent of the original story intact for most readers, one of the stories becomes the dominant story, the other becomes a background.
Perhaps a story with solid emotional content and a science fiction background is more popular for the general reading population. One estimate of the science fiction audience is 20 percent. If you include fantasy with science fiction, the percentage goes up a good amount. It would appear that in order to dramatically increase a science fiction author's readership, the science fiction aspect of a story needs to be second place. Good character development is apparently one way to do this.