There are any number of really good reasons why you would want to turn speech into text. Gotta dash off a quick message to someone but you're already late. You're in the car and need to reply to something but there's no good place to pull over. Etc. and on and on.
But what about the reverse? Are there just as many really good reasons why you'd want to turn text into speech? We mean other than having the voice of Darth Vader say rude things about your friend's mom? The answer turns out to be, yes, even if you don't have a disability and a real need for text-to-speech services (TTS).