You can add me to the list of people you know (even tenuously!) and I'll say that I would not shed a tear if the UI of my Honda's infotainment system completely disappeared. It's a piece of ****.
There isn't even a PAUSE button in the music player. WTF.
I use CarPlay all the time, and only mess with the stock system to change a setting on the car itself (which is getting more and more rare as time goes on).
Yep, my Honda Infotainment and even Garmin maps is not worth the effort. Apple Maps have improved greatly and always gets me the best route.
My biggest complaint with CarPlay is 3rd Party Apps. Apps that don't launch from the cars touchscreen until the phone is opened should not be approved by Apple. iHeart Radio is the biggest offender. Otherwise, I love CarPlay.