I agree that it would be distracting if you were to always try to look at that screen but usually you would just listen to the what the navigation is saying anyway (i.e. "in 100m turn right onto oak street").
I can see it being distracting at night when your entire dash is lit-up right in front of you which will probably be lighting up your face as you drive haha.

I'm guessing that you can switch to different dash modes from like Navi to a black screen if you don't want to see the map all the time.