very good take on twitter but i say we push this further
all [genre] writers should read outside of their chosen genre. fictionists should read poetry and nonfiction. essayists should read poetry and fiction. poets should read fiction and nonfiction.
this ultimately unlocks different techniques that are not "usually" used in your chosen genre but can definitely be employed in it. it makes you a more well-rounded writer with a larger arsenal of tools and tricks.
part of why my fiction (fanfic included) has a lot of pieces that are so heavy on internality is because i specialized in nonfiction in college. the walking through the thought process, the chewing on concepts, the weight and heft of emotion, those came from nonfiction and i apply them in my fiction. part of why my poetry (back when i wrote poetry) is so narrative is because i read and wrote a lot of fiction, employing the story alongside the images helped me.
everybody always says every writer has to be a reader, and that is #sotrue, but you also have to be intentional with what you read. venture outside the borders of what youre used to. expand your horizons.