Yeah, "some people" -- my partner for one. But efficacy is low, even with all her practice. And there aren't many such people -- look at what's happening to Amazon's alexa unit.

I do mainly use voice to control my watch, which means in practice it's pretty much a read-only device (which is just fine for me).

> Think times when you can't call the person but need to send them a quick message, eg noisy festival or loud bar.

Aren't these precisely cases where speech doesn't work? Too noisy to hear you; too noisy for you to hear the message.