Strict genre taxonomy is an unsolvable problem in my opinion. Take this business about being scientific as an example: sorry gang, but a functioning FTL drive i

Strict genre taxonomy is an unsolvable problem in my opinion. Take this business about being scientific as an example: sorry gang, but a functioning FTL drive is not one bit less magical than a wizard casting a fireball out of a magic wand while riding on a dragon. Even if you use the language of science to talk about it. Both are violations of the laws of physics, and I do not believe it's helpful to say that one impossible thing is less impossible than another impossible thing. When it gets down to it, science fiction, and fantasy, and science fantasy, and urban fantasy, and every other genre is defined by this: where in the store can we put the book so that customers buy it? What tropes should we tell the artist to paint on the cover, so the customers who like that stuff know they should buy it? Stuff like that. In other words, think of genres only as artificial marketing concepts, it's the only thing that makes sense.