This is why it's good to have options.
I don't need voice to text message someone to say "I'll be there in 5 minutes." Thumb typing that isn't a horrifying waste of time.
If I need to explain a nuanced and complicated issue, a keyboard makes more sense than thumb typing, but voice may make the most sense as more communication per unit of time is possible that way.
The benefit text has over voice is transcript review.
Ideally we reap the benefits of all of these methods of communication.