"I figured it was like ballet dancing; dancers strive to be the best they can at their craft for its own sake, as well as to impress the judges—that small group who can actually detect the nuances between two different performances.
That’s all wrong. Writing isn’t for English teachers or judges of essay contests—it’s for everyone. It is our most pervasive tool for communicating ideas. You should care about writing not for its own sake, but because you care about ideas. You care about clear thinking and the clear and honest expression of that thinking. "
Even if you write only the occasional email, it's very useful.