Creators are only influenced by stuff from inside said genre. You can tell when a creator of superhero stories only reads other superhero stories. His stories start to be filled with weird obscure stuff that only people who are obsessed with superheroes will understand. But at the same time their work is very derivative, either playing off established works or referencing stuff that already exists within the genre.

Compare this to older creators who didn’t have decades of in genre material to pull from and hade to pull from else where.