So, some vehicle manufacturers use a touch screen, and others use rotary knobs or similar for screen navigation. Android Auto forced manufacturers to choose one or the other in the event that they have the capability of both.

The problem encountered on Waze is that for non-touch screen versions, there is a loss of major functionality. One of which is the ability to change the zoom level or move the focus on the map while moving. There are often times where you will see a traffic jam, or something similar, and it is helpful to change the zoom or focus so that you can see the extent of the backup and make a quick decision to take the next exit or not. (This is just one scenario - and bear in mind, I am aware that this is not likely safe for the driver... but luckily, my car has room for at least one more passenger who could do this)

So, in my car with a touch screen, this is as easy as a pinch zoom or swipe with fingers to scroll around on the map. But, in a vehicle with touch screen disabled (in my case with a rotary knob), you can only zoom in or out, and that can only be done at a full stop. I have one of each type of vehicle.

Seems like they could have the zoom and possibly add a button to move the screen to accommodate the lack of touch screen capability (I know the zoom could be unlocked and that at least works from a stop).