In my other car, which adheres to the “buttons for nearly everything” philosophy, the steering wheel heater (for example) is down by the driver’s left knee, even using it via the touchscreen is probably safer.
Experiences with this sort of thing are subjective, but I’ve never had any problems with Google Assistant in the car.
“Hey Google, set the driver’s side heated seat to one”
“Hey Google, turn off the steering wheel heater”