Power
The written word is one of the most powerful human inventions in existence. As a stenographer, you will be recording trils and hearings and public meetings and maybe even press conferences and television shows, all of which have their own kind of power. But how much influence does the actual stenographer have in shaping the world? Just slightly less than the stenotype machine itself.
But what if a stenographer decides to use their job for nefarious (that means, like, really bad) purposes? What if they take a stance and write a manifesto in place of the actual decisions being made at a public hearing? Simple: They get fired. Stenographers don't actually publish anything; they just transcribe phonetically and then translate what they've written into English.
So yeah, you could write a long-winded diatribe against the latest American Idol winner in your secret phonetic language, but the final transcript is going to have to be whatever the people said at the hearing (no matter how non-American-Idol-related it may have been.).