I can easily send a text by just telling Siri, text (whoever) and say my short message, and say send.
I just don't have any "mission critical" messages or phone calls in my life. If I am in heavy interstate traffic and 60 MPH or so, I will not even do the voice text. I pay 100% attention to the road and traffic.
In traffic like this, yea, I might use Siri to send a text.
I have not been involved in a car wreck since I failed to wait at a stop sign for the idiot to actually make their stop, back in 1978. They just ran the stop sign and got me. Partially my fault for thinking they could see a giant red stop sign and obey traffic signs.