I often come across posts where people are discussing the logic of a movie or comic book. An example could be Star Wars, where they discuss how a light saber works. Or which superheroes would win in a fight against each other. To me, it seems pointless to discuss such things as it is fiction. Just an insight into someone else’s imagination.
It’s fun. There are two angles you can come at how lightsabers work from: how they work in the Star Wars fictional universe, and how something like that might work in our universe. The former builds out the fictional universe into something more “reasonable” in the sense that you can reason within the internal rules of the fiction. Reasoning about fictional worlds, especially with other people, is very fun (see D&D, or religion). The latter is a fun scientific diversion that could even lead to real inventions.