There are people still using onboard navigation systems in cars?
Hell yes. The Mazda is brand new and so is its nav system. It is absolutely superb and MUCH easier/safer to use while driving than the phone. It has voice controls that are actually useful, and things like pictures of complicated intersections and off-ramps to show you which lane to be in. Most importantly, though, it's integrated with the HUD, and Google Maps is not - even when attached via Android Auto. The HUD provides navigation information like distance to next turn, direction of turn, name of street, and when you get really close it adds a closing distance bar - all right on the windshield. It knows about road closures and accidents, too.
It's less good at allowing the manual choice of alternate routes. In fact, other than limited preferences like "Avoid toll roads" I don't think there IS any ability to choose an alternate route the way Google gives at the beginning. Or if there is one, it's not at all intuitive. Also, it obviously doesn't do the speed trap and other crowd-sourced stuff.
But that less-good stuff pales in comparison to having the information on the HUD.