I believe they are common because people believe that is where we could be headed. Will we run society into the ground, or will we prosper? Will the society be a "Divergent" or "Giver" society or will it exist as it does today? Since we have no way of knowing, we pretend we do.
Explanation:
In addition, the narrative limitations can force some scenes to change or even the creation of new ones, instead. Because, ultimately, the only narrators of a movie are the camera and the characters through their dialogues, which leads to true challenges to introduce all the events from a book.
Using short sentences makes the author sound rude. using run-on sentences makes the author seem super talkative. I suggest use medium length sentences to set the tone.
