A good point. People aspiring to be professional writers are often encouraged to widely read as much as they can of the genre in which they're interested. As yo

A good point. People aspiring to be professional writers are often encouraged to widely read as much as they can of the genre in which they're interested. As you said, some information about structure, style, etc is absorbed. In addition they gain an understanding of the current status quo in the area that allows them to see the direction they may want to go in to make their own voice unique, which tropes they may want to subvert, or the style of specific sub-genres that may resonate with them and inspire them in that direction. Or the type that is most commercially successful in current tastes & trends. it is after all a business and the writer, no matter how hard they strive to make their voice unique, is trying to make a living. I've followed Charlie Stross's writing about the business side of the industry and it's very common to work with editors & agents to ensure they're writing in a marketable sub genre. For example, imagine a writer that had a story outline set in a alternate timeline epic fiction where magic existed, but current tastes among readers looking for epic length books skewed towards space opera. An author might without too much difficulty map many plot points onto space opera settings. Magic becomes advanced technology. Empires can exist in both; historical details can be mapped onto the fictional societies & their history, etc. At the same time, the tropes specific and unique to alternate timeline historical fiction might be adapted and morphed in the space opera genre to create something a bit more unique. But a writer could not easily make those kinds of adaptions without being well read in the umbrella genre.