>>150996868
JJBA's creator has an excellent book on the topic of creating manga (although the same advice applies towards comics). Araki stresses that a quality mangaka MUST be disciplined and well-trained at both writing and drawing.

Getting good at writing is fundamentally no different than getting good at art, or any creative endeavor for that matter.

>copy and trace a lot until you don't have to anymore (it's like training wheels)
>study your favorite creators, break down their styles, and research what inspired them
>let your imagination wander
>take influence and inspiration from various genres, mediums, cultures, etc

>>150991068
There's a cultural reason for it: a lot of American artists HATE the idea of reading books or having to read in order to write effectively. Part of it is because a certain percentage of artists more than likely have dyslexia or some kind of disability, but it's especially because being good at art is what makes them feel good about themselves since they might struggle with reading/writing/math/science, etc. So when they get told "get better at writing", they get pissy because it's like telling them that their art skills are basically worthless and that makes them no different than someone who doesn't/can't read well and also sucks at drawing.