I think you're definitely an exception. I work with large editorial staffs every single day and haven't come across a single person who I think would feel comfortable crafting a "dynamic" story that is susceptible to losing and gaining chunks of copy depending on how much space there is. It would be a total sea change for how most editorial shops operate. They are so detail oriented, and to them, every word counts and has a distinct purpose within the greater text. Basically, if it could be cut, it would have already been cut (either by the author or by a managing editor).

To have a whole section arbitrarily cut from the version of an article that user X reads on their iPad vs user Y on a big screen laptop would be met with skepticism at best, outright horror at worst.

I am a writer as well and I can't imagine writing like that or how such a system could possibly work from a technical perspective, much less a UI perspective.

PS. I didn't mean to say that creative people can't be technical or vice-versa, just that writing tends to be a creative-oriented job while programming is obviously a technical-oriented job. Obviously there is overlap between the two and many people excel at both. Sorry if it came out sounding like I believe there is a creative|technical binary.