That’s the great thing about CarPlay it makes the usually junk infotainment system in cars (especially older ones) irrelevant, so they still seem modern.
For a budget car, I’d be perfectly happy if they had a screen for CarPlay/Android Auto that didn’t do anything else if a phone wasn’t connected. I think this makes a lot of sense as a cost cutting measure. Maybe it would just be used for the mandated backup camera.
I also love it for rental cars. I can get in any rental, and instead of having to learn my way around or figure out a Garmin add-on, CarPlay can make the navigation and music instantly familiar with all the data I need.