This is like saying analog music is too segmented because both rock and metal are played with guitars. Imagine searching a huge "analog music" catalog for hours

This is like saying analog music is too segmented because both rock and metal are played with guitars. Imagine searching a huge "analog music" catalog for hours and hours until you stumble on Country music. You would go through so many other genres until stumbling on what you were looking for. People make music first and labels appear after. An example I like is Witch House. The name was originally conceived as a joke: "Myself and my friend Shams were joking about the sort of house music we make, [calling it] witch house because it’s, like, occult-based house music. I did this best-of-the-year thing with Pitchfork about witch house. I was saying that we were witch house bands, and 2010 was going to be the year of witch house. It took off from there. But, at the time, when I said witch house, it didn’t even really exist..." "Shortly after being mentioned to Pitchfork, blogs and other mainstream music press began to use the term. Flavorwire said that despite Egedy's insistence, 'the genre does exist now, for better or worse'."