The point of the article was in encouraging writers to hone in on an individual voice as opposed to being influenced by thousands of competing tones.
Perhaps an analogy to songwriting will make things more clear: how well received are the works of someone who writes rap-funk-metal-folk-electro-bluegrass songs?
It's not that a successful country music songwriter can't listen to and enjoy hip-hop but you'll find they tend mainly to listen to and be influenced by country music.
Perhaps an analogy to songwriting will make things more clear: how well received are the works of someone who writes rap-funk-metal-folk-electro-bluegrass songs?
It's not that a successful country music songwriter can't listen to and enjoy hip-hop but you'll find they tend mainly to listen to and be influenced by country music.