For instance in Station Eleven the author had clearly thought about how society and the economy might function after a sudden and massive drop in population and what she came up with was a version of medieval society with small towns, agricultural based economy, peddlers going from town to town and wandering actors/minstrals. It seemed sustainable and logical.
One of the most annoying stories was Wayward Pines. It just seemed completely unsustainable to me. There was no explanation of where food came from, and people had weird jobs allocated to them that didn't seem to contribute to the economy. There was also no explanation of what the genetic mutation was that caused humanity to rapidly devolve, nor any explanation of why the same thing wouldn't happen to the recently revived human population. And he seemed to have a huge technical team that knew what was going on and had volunteered to be frozen and revived in the future, so why didn't he just go with volunteers instead of kidnapping random people?