Earlier quoted context omitted.
Oh yes Apple "wraps" their AI in a "privacy architecture" -- you can't use Carplay unless you turn it (Siri) on.
How do you expect to use a nav system while driving without voice control?
I don't know how it works on CarPlay but when I turn my car on I have a bunch of suggested addresses (home, work, parents, recent Maps searches, etc) that I just touch-to-go. Having to use voice every time you want to navigate not only sounds unnecessary, but cumbersome.