My car has voice-control, so I press a button on the steering wheel, speak my destination, and I'm good to go. It works really well. I can't do this easily on a smartphone while I'm driving.
The "big-screen dinosaur" is incredibly helpful for showing routes and directions, much better than the dinky smartphone screen.
Bluetooth headset + phone gives you the same functionality. They even have bluetooth buttons you can attach to your steering wheel if reaching up to your ear isn't something you want to do.
Now you have to keep track of chargers, and kludge things onto your car. A button on your wheel, a holder on your window or clipped somehow onto your dash.
The bluetooth buttons just connect to your car. Install it, and then never mess with it again.
I assume most people take their phone around with them these days. I have a magnetic mount in my car, so as I'm sitting down I just lay it on the magnet on the dash and go.
It's possible to speak to the phone using the buttons of the car. Specifically pressing the dial or command button. If your car has bluetooth phone audio, or bluetooth "music" audio connection it becomes a lot more possible.
Ford has a good passthrough to Android (hold down Speak button). GM has a terrible system that requires you to wait to speak for a quiet beep, and chides you if you don't. It's very odd and never fails to infuriate me.
The "big-screen dinosaur" is incredibly helpful for showing routes and directions, much better than the dinky smartphone screen.