I have a problem with the contrast of the map when using Apple CarPlay. On my iPhone the contrast is excellent and the route I have to follow is easy to distinguish from the rest on the map.
On the display in the car, the contrast between the route to be followed and the other map elements appears to be very poor. This means you have to pay close attention to which line on the map is your route. As a result, attention is diverted too much from the road.
My proposal is to make the colors of the route (and of the other elements?) adjustable, so that you can adjust that. Then the map becomes a lot more usable and using Waze becomes a lot safer.