For some reason, non of the cellphone apps are that intuitive. Moving between Apple Maps and Google Maps is difficult as neither is that intuitive when setting up multiple stop trips.
Nothing to my mind beats a Garmin device for the UI.
I don’t know how much Garmin makes on its hardware, but if they sold their software as an iOS, macOS, Android, Web, and Windows app, I’d buy it in an instance. Running a Garmin UI map app under CarPlay would be just absolutely the way to go, yet be able to set routes up on the big screen of macOS, Windows, or the Web would be absolute heaven.