Superhuman powers, with the exception of psionic abilities like telepathy, are primarily an element of visual spectacle. This is primarily why fiction with people with some form of superhuman abilities have proliferated in film, comic books, and anime/manga, because it is something the audience can see rather than feel/visualize.
However, in a written medium (i.e., books), visual spectacle is downplayed. I have often heard it said the meat of a visual work is the typically the spectacle or action, whereas in a written work it is dialogue and thought. This, in turn, is influenced by the traits of the work, in a visual medium the viewer can see flashy scenes or more easily notice subtle cues in the actor's voice or body language, whereas in written mediums the reader is able to get an internal look at the characters' thought processes.
I have a story that involves people with supernatural powers getting in fights with one another. The problem I'm noticing is that the action scenes feel boring to write and like filler. There are moments in the fight that result in character development (or how the supernatural powers affect their character), yet I find myself only interested in writing those parts and not the proper build-up to make the scene paced appropriately. I think a lot of this has to do with the fact that most superpowers are visually oriented and thus what would be a big-budget fight scene in a visual medium ends up just being a line of text in a written work.
However, it is not possible to simply excise these parts from the story, as they are key in influencing the character's thought processes and development. E.g., a lot of the actions the characters take are influenced by the fact they live in a dog-eat-dog world or are expected to fight to survive, and if I don't show this it feels like there are no stakes or conflict. How can I make fight scenes with superpowers interesting when I do not have visual spectacle to fall back on?