People love putting things into neat little boxes.
For things like infrastructure design, this is great. I'm super glad that road space is well defined enough for you to not kill me in your car. I'm also pretty happy with Netflix's ability to read my tastes and present relevant content.
When we're creating, though, it can be hard to disconnect from all the genres, categories, and subreddits. It's easy to think "what I'm doing feels so different from anything else".