I looked at longevity in show business when I was about 13 and the people who seemed to have longevity were the ones who'd spent quite a bit of time learning about what they were doing before they made it.
Think about how much it costs to incarcerate someone. Do we want them just sitting in prison lifting weights becoming violent and thinking about the next crime? Or do we want them having a little purpose in life and learning a skill?
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Early on it's good to develop the ability to write. Learning to write is a useful exercise even if what you're writing about is not that relevant.