> Sure, but a lot of cars don't have them, and that's just the speedometer, not the speed limit or navigation directions (which are usually what I'm glancing at my phone's map app to check)

That's not the case at all.

Two pictures from Audi: https://uploads.audi-mediacenter.com/system/production/media... and https://robbreport.com/wp-content/uploads/2021/03/q4etron01.... - navigation, speedometer and speed limit and more